「App:Library:LVGL:docs:Overview:Displays」の版間の差分

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= Displays =
 
= Displays =
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Important
 
Important
  
 
The basic concept of a ''display'' in LVGL is explained in the [Porting](/porting/display) section. So before reading further, please read the [Porting](/porting/display) section first.
 
The basic concept of a ''display'' in LVGL is explained in the [Porting](/porting/display) section. So before reading further, please read the [Porting](/porting/display) section first.
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== Multiple display support ==
 
== Multiple display support ==
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In LVGL you can have multiple displays, each with their own driver and objects. The only limitation is that every display needs to have the same color depth (as defined in <code>LV_COLOR_DEPTH</code>). If the displays are different in this regard the rendered image can be converted to the correct format in the drivers <code>flush_cb</code>.
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In LVGL you can have multiple displays, each with their own driver and objects. The only limitation is that every display needs to have the same color depth (as defined in <code style="color: #bb0000;">LV_COLOR_DEPTH</code>). If the displays are different in this regard the rendered image can be converted to the correct format in the drivers <code style="color: #bb0000;">flush_cb</code>.
  
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Creating more displays is easy: just initialize more display buffers and register another driver for every display. When you create the UI, use <code>lv_disp_set_default(disp)</code> to tell the library on which display to create objects.
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Creating more displays is easy: just initialize more display buffers and register another driver for every display. When you create the UI, use <code style="color: #bb0000;">lv_disp_set_default(disp)</code> to tell the library on which display to create objects.
  
 
Why would you want multi-display support? Here are some examples:
 
Why would you want multi-display support? Here are some examples:
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* Have some smaller and simple displays in a large instrument or technology.
 
* Have some smaller and simple displays in a large instrument or technology.
 
* Have two large TFT displays: one for a customer and one for the shop assistant.
 
* Have two large TFT displays: one for a customer and one for the shop assistant.
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=== Using only one display ===
 
=== Using only one display ===
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Using more displays can be useful but in most cases it's not required. Therefore, the whole concept of multi-display handling is completely hidden if you register only one display. By default, the last created (and only) display is used.
 
Using more displays can be useful but in most cases it's not required. Therefore, the whole concept of multi-display handling is completely hidden if you register only one display. By default, the last created (and only) display is used.
  
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<code>lv_scr_act()</code>, <code>lv_scr_load(scr)</code>, <code>lv_layer_top()</code>, <code>lv_layer_sys()</code>, <code>LV_HOR_RES</code> and <code>LV_VER_RES</code> are always applied on the most recently created (default) display. If you pass <code>NULL</code> as <code>disp</code> parameter to display related functions the default display will usually be used. E.g. <code>lv_disp_trig_activity(NULL)</code> will trigger a user activity on the default display. (See below in Inactivity).
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<code style="color: #bb0000;">lv_scr_act()</code>, <code style="color: #bb0000;">lv_scr_load(scr)</code>, <code style="color: #bb0000;">lv_layer_top()</code>, <code style="color: #bb0000;">lv_layer_sys()</code>, <code style="color: #bb0000;">LV_HOR_RES</code> and <code style="color: #bb0000;">LV_VER_RES</code> are always applied on the most recently created (default) display. If you pass <code style="color: #bb0000;">NULL</code> as <code style="color: #bb0000;">disp</code> parameter to display related functions the default display will usually be used. E.g. <code style="color: #bb0000;">lv_disp_trig_activity(NULL)</code> will trigger a user activity on the default display. (See below in Inactivity).
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=== Mirror display ===
 
=== Mirror display ===
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To mirror the image of a display to another display, you don't need to use multi-display support. Just transfer the buffer received in <code>drv.flush_cb</code> to the other display too.
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To mirror the image of a display to another display, you don't need to use multi-display support. Just transfer the buffer received in <code style="color: #bb0000;">drv.flush_cb</code> to the other display too.
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=== Split image ===
 
=== Split image ===
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You can create a larger virtual display from an array of smaller ones. You can create it as below:
 
You can create a larger virtual display from an array of smaller ones. You can create it as below:
  
 
# Set the resolution of the displays to the large display's resolution.
 
# Set the resolution of the displays to the large display's resolution.
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# In <code>drv.flush_cb</code>, truncate and modify the <code>area</code> parameter for each display.
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# In <code style="color: #bb0000;">drv.flush_cb</code>, truncate and modify the <code style="color: #bb0000;">area</code> parameter for each display.
 
# Send the buffer's content to each real display with the truncated area.
 
# Send the buffer's content to each real display with the truncated area.
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== Screens ==
 
== Screens ==
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Every display has its own set of screens and the objects on each screen.
 
Every display has its own set of screens and the objects on each screen.
  
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* Screens are the high-level root objects associated with a particular display. One display can have multiple screens associated with it, but not vice versa.
 
* Screens are the high-level root objects associated with a particular display. One display can have multiple screens associated with it, but not vice versa.
  
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Screens can be considered the highest level containers which have no parent. A screen's size is always equal to its display and their origin is (0;0). Therefore, a screen's coordinates can't be changed, i.e. <code>lv_obj_set_pos()</code>, <code>lv_obj_set_size()</code> or similar functions can't be used on screens.
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Screens can be considered the highest level containers which have no parent. A screen's size is always equal to its display and their origin is (0;0). Therefore, a screen's coordinates can't be changed, i.e. <code style="color: #bb0000;">lv_obj_set_pos()</code>, <code style="color: #bb0000;">lv_obj_set_size()</code> or similar functions can't be used on screens.
  
 
A screen can be created from any object type but the two most typical types are Base object and Image (to create a wallpaper).
 
A screen can be created from any object type but the two most typical types are Base object and Image (to create a wallpaper).
  
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To create a screen, use <code>lv_obj_t * scr = lv_<type>_create(NULL, copy)</code>. <code>copy</code> can be an existing screen copied into the new screen.
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To create a screen, use <code style="color: #bb0000;">lv_obj_t * scr = lv_<type>_create(NULL, copy)</code>. <code style="color: #bb0000;">copy</code> can be an existing screen copied into the new screen.
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To load a screen, use <code style="color: #bb0000;">lv_scr_load(scr)</code>. To get the active screen, use <code style="color: #bb0000;">lv_scr_act()</code>. These functions work on the default display. If you want to specify which display to work on, use <code style="color: #bb0000;">lv_disp_get_scr_act(disp)</code> and <code style="color: #bb0000;">lv_disp_load_scr(disp, scr)</code>. A screen can be loaded with animations too. Read more here.
  
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To load a screen, use <code>lv_scr_load(scr)</code>. To get the active screen, use <code>lv_scr_act()</code>. These functions work on the default display. If you want to specify which display to work on, use <code>lv_disp_get_scr_act(disp)</code> and <code>lv_disp_load_scr(disp, scr)</code>. A screen can be loaded with animations too. Read more here.
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Screens can be deleted with <code style="color: #bb0000;">lv_obj_del(scr)</code>, but ensure that you do not delete the currently loaded screen.
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Screens can be deleted with <code>lv_obj_del(scr)</code>, but ensure that you do not delete the currently loaded screen.
 
  
 
=== Transparent screens ===
 
=== Transparent screens ===
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Usually, the opacity of the screen is <code>LV_OPA_COVER</code> to provide a solid background for its children. If this is not the case (opacity < 100%) the display's background color or image will be visible. See the Display background section for more details. If the display's background opacity is also not <code>LV_OPA_COVER</code> LVGL has no solid background to draw.
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Usually, the opacity of the screen is <code style="color: #bb0000;">LV_OPA_COVER</code> to provide a solid background for its children. If this is not the case (opacity < 100%) the display's background color or image will be visible. See the Display background section for more details. If the display's background opacity is also not <code style="color: #bb0000;">LV_OPA_COVER</code> LVGL has no solid background to draw.
  
 
This configuration (transparent screen and display) could be used to create for example OSD menus where a video is played on a lower layer, and a menu is overlayed on an upper layer.
 
This configuration (transparent screen and display) could be used to create for example OSD menus where a video is played on a lower layer, and a menu is overlayed on an upper layer.
  
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To handle transparent displays, special (slower) color mixing algorithms need to be used by LVGL so this feature needs to enabled with <code>LV_COLOR_SCREEN_TRANSP</code> in <code>lv_conf.h</code>. As this mode operates on the Alpha channel of the pixels <code>LV_COLOR_DEPTH = 32</code> is also required. The Alpha channel of 32-bit colors will be 0 where there are no objects and 255 where there are solid objects.
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To handle transparent displays, special (slower) color mixing algorithms need to be used by LVGL so this feature needs to enabled with <code style="color: #bb0000;">LV_COLOR_SCREEN_TRANSP</code> in <code style="color: #bb0000;">lv_conf.h</code>. As this mode operates on the Alpha channel of the pixels <code style="color: #bb0000;">LV_COLOR_DEPTH = 32</code> is also required. The Alpha channel of 32-bit colors will be 0 where there are no objects and 255 where there are solid objects.
  
 
In summary, to enable transparent screens and displays for OSD menu-like UIs:
 
In summary, to enable transparent screens and displays for OSD menu-like UIs:
  
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* Enable <code>LV_COLOR_SCREEN_TRANSP</code> in <code>lv_conf.h</code>
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* Enable <code style="color: #bb0000;">LV_COLOR_SCREEN_TRANSP</code> in <code style="color: #bb0000;">lv_conf.h</code>
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* Be sure to use <code>LV_COLOR_DEPTH 32</code>
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* Be sure to use <code style="color: #bb0000;">LV_COLOR_DEPTH 32</code>
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* Set the screen's opacity to <code>LV_OPA_TRANSP</code> e.g. with <code>lv_obj_set_style_local_bg_opa(lv_scr_act(), LV_OBJMASK_PART_MAIN, LV_STATE_DEFAULT, LV_OPA_TRANSP)</code>
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* Set the screen's opacity to <code style="color: #bb0000;">LV_OPA_TRANSP</code> e.g. with <code style="color: #bb0000;">lv_obj_set_style_local_bg_opa(lv_scr_act(), LV_OBJMASK_PART_MAIN, LV_STATE_DEFAULT, LV_OPA_TRANSP)</code>
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* Set the display opacity to <code>LV_OPA_TRANSP</code> with <code>lv_disp_set_bg_opa(NULL, LV_OPA_TRANSP);</code>
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* Set the display opacity to <code style="color: #bb0000;">LV_OPA_TRANSP</code> with <code style="color: #bb0000;">lv_disp_set_bg_opa(NULL, LV_OPA_TRANSP);</code>
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== Features of displays ==
 
== Features of displays ==
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=== Inactivity ===
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A user's inactivity time is measured on each display. Every use of an Input device (if associated with the display) counts as an activity. To get time elapsed since the last activity, use <code style="color: #bb0000;">lv_disp_get_inactive_time(disp)</code>. If <code style="color: #bb0000;">NULL</code> is passed, the lowest inactivity time among all displays will be returned (NULL isn't just the default display).
  
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=== Inactivity ===
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You can manually trigger an activity using <code style="color: #bb0000;">lv_disp_trig_activity(disp)</code>. If <code style="color: #bb0000;">disp</code> is <code style="color: #bb0000;">NULL</code>, the default screen will be used (and not all displays).
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A user's inactivity time is measured on each display. Every use of an Input device (if associated with the display) counts as an activity. To get time elapsed since the last activity, use <code>lv_disp_get_inactive_time(disp)</code>. If <code>NULL</code> is passed, the lowest inactivity time among all displays will be returned (NULL isn't just the default display).
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You can manually trigger an activity using <code>lv_disp_trig_activity(disp)</code>. If <code>disp</code> is <code>NULL</code>, the default screen will be used (and not all displays).
 
  
 
=== Background ===
 
=== Background ===
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Every display has a background color, background image and background opacity properties. They become visible when the current screen is transparent or not positioned to cover the whole display.
 
Every display has a background color, background image and background opacity properties. They become visible when the current screen is transparent or not positioned to cover the whole display.
  
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The background color is a simple color to fill the display. It can be adjusted with <code>lv_disp_set_bg_color(disp, color)</code>;
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The background color is a simple color to fill the display. It can be adjusted with <code style="color: #bb0000;">lv_disp_set_bg_color(disp, color)</code>;
  
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The display background image is a path to a file or a pointer to an <code>lv_img_dsc_t</code> variable (converted image data) to be used as wallpaper. It can be set with <code>lv_disp_set_bg_image(disp, &my_img)</code>; If a background image is configured the background won't be filled with <code>bg_color</code>.
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The display background image is a path to a file or a pointer to an <code style="color: #bb0000;">lv_img_dsc_t</code> variable (converted image data) to be used as wallpaper. It can be set with <code style="color: #bb0000;">lv_disp_set_bg_image(disp, &my_img)</code>; If a background image is configured the background won't be filled with <code style="color: #bb0000;">bg_color</code>.
  
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The opacity of the background color or image can be adjusted with <code>lv_disp_set_bg_opa(disp, opa)</code>.
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The opacity of the background color or image can be adjusted with <code style="color: #bb0000;">lv_disp_set_bg_opa(disp, opa)</code>.
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The <code style="color: #bb0000;">disp</code> parameter of these functions can be <code style="color: #bb0000;">NULL</code> to select the default display.
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The <code>disp</code> parameter of these functions can be <code>NULL</code> to select the default display.
 
  
 
== API ==
 
== API ==
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Enums
 
Enums
  
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<span style="background-color:#e7f2fa;color:#2980b9;">enum lv_scr_load_anim_t </span>
 
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:; <span id="_CPPv3N18lv_scr_load_anim_t21LV_SCR_LOAD_ANIM_NONEE"></span><span id="_CPPv2N18lv_scr_load_anim_t21LV_SCR_LOAD_ANIM_NONEE"></span><span id="lv__disp_8h_1a0f753e364206eb26e1ad7c10d737b06eac4d7241159e71b5710d9d2dfea9c9e49" class="target"></span>enumerat[https://docs.lvgl.io/8.2/overview/display.html#_CPPv418lv_scr_load_anim_t]or LV_SCR_LOAD_ANIM_NONE[https://docs.lvgl.io/8.2/overview/display.html#_CPPv4N18lv_scr_load_anim_t21LV_SCR_LOAD_ANIM_NONEE] <span id="_CPPv3N18lv_scr_load_anim_t21LV_SCR_LOAD_ANIM_NONEE"></span><span id="_CPPv2N18lv_scr_load_anim_t21LV_SCR_LOAD_ANIM_NONEE"></span><span id="lv__disp_8h_1a0f753e364206eb26e1ad7c10d737b06eac4d7241159e71b5710d9d2dfea9c9e49" class="target"></span>
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::
−
:; <span id="_CPPv3N18lv_scr_load_anim_t27LV_SCR_LOAD_ANIM_MOVE_RIGHTE"></span><span id="_CPPv2N18lv_scr_load_anim_t27LV_SCR_LOAD_ANIM_MOVE_RIGHTE"></span><span id="lv__disp_8h_1a0f753e364206eb26e1ad7c10d737b06eaf35915bc6d1ac1c08575d6492fb4b752" class="target"></span>enumerator LV_SCR_LOAD_ANIM[https://docs.lvgl.io/8.2/overview/display.html#_CPPv4N18lv_scr_load_anim_t26LV_SCR_LOAD_ANIM_MOVE_LEFTE]_MOVE_RIGHT[https://docs.lvgl.io/8.2/overview/display.html#_CPPv4N18lv_scr_load_anim_t27LV_SCR_LOAD_ANIM_MOVE_RIGHTE] <span id="_CPPv3N18lv_scr_load_anim_t27LV_SCR_LOAD_ANIM_MOVE_RIGHTE"></span><span id="_CPPv2N18lv_scr_load_anim_t27LV_SCR_LOAD_ANIM_MOVE_RIGHTE"></span><span id="lv__disp_8h_1a0f753e364206eb26e1ad7c10d737b06eaf35915bc6d1ac1c08575d6492fb4b752" class="target"></span>
+
: <span style="background-color: #eeeeee;">enumerator LV_SCR_LOAD_ANIM_MOVE_RIGHT </span>
 
::
 
::
−
:; <span id="_CPPv3N18lv_scr_load_anim_t25LV_SCR_LOAD_ANIM_MOVE_TOPE"></span><span id="_CPPv2N18lv_scr_load_anim_t25LV_SCR_LOAD_ANIM_MOVE_TOPE"></span><span id="lv__disp_8h_1a0f753e364206eb26e1ad7c10d737b06ea7ce2102f40dd52daa98854e85a341d29" class="target"></span>enumerator LV_SCR_LOAD_ANIM_[https://docs.lvgl.io/8.2/overview/display.html#_CPPv4N18lv_scr_load_anim_t27LV_SCR_LOAD_ANIM_MOVE_RIGHTE]MOVE_TOP[https://docs.lvgl.io/8.2/overview/display.html#_CPPv4N18lv_scr_load_anim_t25LV_SCR_LOAD_ANIM_MOVE_TOPE] <span id="_CPPv3N18lv_scr_load_anim_t25LV_SCR_LOAD_ANIM_MOVE_TOPE"></span><span id="_CPPv2N18lv_scr_load_anim_t25LV_SCR_LOAD_ANIM_MOVE_TOPE"></span><span id="lv__disp_8h_1a0f753e364206eb26e1ad7c10d737b06ea7ce2102f40dd52daa98854e85a341d29" class="target"></span>
+
: <span style="background-color: #eeeeee;">enumerator LV_SCR_LOAD_ANIM_MOVE_TOP </span>
 
::
 
::
−
:; <span id="_CPPv3N18lv_scr_load_anim_t28LV_SCR_LOAD_ANIM_MOVE_BOTTOME"></span><span id="_CPPv2N18lv_scr_load_anim_t28LV_SCR_LOAD_ANIM_MOVE_BOTTOME"></span><span id="lv__disp_8h_1a0f753e364206eb26e1ad7c10d737b06eaceab5be119341c6f2a22c91cd3a1ec52" class="target"></span>enumerator LV_SCR_LOAD_ANI[https://docs.lvgl.io/8.2/overview/display.html#_CPPv4N18lv_scr_load_anim_t25LV_SCR_LOAD_ANIM_MOVE_TOPE]M_MOVE_BOTTOM[https://docs.lvgl.io/8.2/overview/display.html#_CPPv4N18lv_scr_load_anim_t28LV_SCR_LOAD_ANIM_MOVE_BOTTOME] <span id="_CPPv3N18lv_scr_load_anim_t28LV_SCR_LOAD_ANIM_MOVE_BOTTOME"></span><span id="_CPPv2N18lv_scr_load_anim_t28LV_SCR_LOAD_ANIM_MOVE_BOTTOME"></span><span id="lv__disp_8h_1a0f753e364206eb26e1ad7c10d737b06eaceab5be119341c6f2a22c91cd3a1ec52" class="target"></span>
+
: <span style="background-color: #eeeeee;">enumerator LV_SCR_LOAD_ANIM_MOVE_BOTTOM </span>
 
::
 
::
−
:; <span id="_CPPv3N18lv_scr_load_anim_t24LV_SCR_LOAD_ANIM_FADE_ONE"></span><span id="_CPPv2N18lv_scr_load_anim_t24LV_SCR_LOAD_ANIM_FADE_ONE"></span><span id="lv__disp_8h_1a0f753e364206eb26e1ad7c10d737b06ea3e415bd11c085aff5bc42db7f945695d" class="target"></span>enumerator LV_SCR_LOAD_ANIM_F[https://docs.lvgl.io/8.2/overview/display.html#_CPPv4N18lv_scr_load_anim_t28LV_SCR_LOAD_ANIM_MOVE_BOTTOME]ADE_ON[https://docs.lvgl.io/8.2/overview/display.html#_CPPv4N18lv_scr_load_anim_t24LV_SCR_LOAD_ANIM_FADE_ONE] <span id="_CPPv3N18lv_scr_load_anim_t24LV_SCR_LOAD_ANIM_FADE_ONE"></span><span id="_CPPv2N18lv_scr_load_anim_t24LV_SCR_LOAD_ANIM_FADE_ONE"></span><span id="lv__disp_8h_1a0f753e364206eb26e1ad7c10d737b06ea3e415bd11c085aff5bc42db7f945695d" class="target"></span>
+
: <span style="background-color: #eeeeee;">enumerator LV_SCR_LOAD_ANIM_FADE_ON </span>
 
::
 
::
  
−
Functions
+
'''Functions'''
  
−
; <span id="_CPPv319lv_disp_get_scr_actP9lv_disp_t"></span><span id="_CPPv219lv_disp_get_scr_actP9lv_disp_t"></span><span id="lv_disp_get_scr_act__lv_disp_tP"></span><span id="lv__disp_8h_1aabefd7ce9a47f468b779dcad4372df2a" class="target"></span>lv_obj_t *lv[https://docs.lvgl.io/8.2/overview/display.html#_CPPv4N18lv_scr_load_anim_t24LV_SCR_LOAD_ANIM_FADE_ONE]_disp_get_scr_act(lv_disp_t *disp)[https://docs.lvgl.io/8.2/overview/display.html#_CPPv419lv_disp_get_scr_actP9lv_disp_t] <span id="_CPPv319lv_disp_get_scr_actP9lv_disp_t"></span><span id="_CPPv219lv_disp_get_scr_actP9lv_disp_t"></span><span id="lv_disp_get_scr_act__lv_disp_tP"></span><span id="lv__disp_8h_1aabefd7ce9a47f468b779dcad4372df2a" class="target"></span>
+
<span style="background-color:#e7f2fa;color:#2980b9;">lv_obj_t *lv_disp_get_scr_act(lv_disp_t *disp) </span>
−
: Return with a pointer to the active screen[https://docs.lvgl.io/8.2/overview/display.html#_CPPv419lv_disp_get_scr_actP9lv_disp_t]
+
: Return with a pointer to the active screen
−
:; Parameters
+
: '''Parameters'''
−
:: disp -- pointer to display which active screen should be get. (NULL to use the default screen)
+
:: '''disp''' -- pointer to display which active screen should be get. (NULL to use the default screen)
−
:; Returns
+
: '''Returns'''
 
:: pointer to the active screen object (loaded by 'lv_scr_load()')
 
:: pointer to the active screen object (loaded by 'lv_scr_load()')
  
−
; <span id="_CPPv320lv_disp_get_scr_prevP9lv_disp_t"></span><span id="_CPPv220lv_disp_get_scr_prevP9lv_disp_t"></span><span id="lv_disp_get_scr_prev__lv_disp_tP"></span><span id="lv__disp_8h_1a5b5470e277e2802fd2ab1b39a1f18219" class="target"></span>lv_obj_t *lv_disp_get_scr_prev(lv_disp_t *disp)[https://docs.lvgl.io/8.2/overview/display.html#_CPPv420lv_disp_get_scr_prevP9lv_disp_t] <span id="_CPPv320lv_disp_get_scr_prevP9lv_disp_t"></span><span id="_CPPv220lv_disp_get_scr_prevP9lv_disp_t"></span><span id="lv_disp_get_scr_prev__lv_disp_tP"></span><span id="lv__disp_8h_1a5b5470e277e2802fd2ab1b39a1f18219" class="target"></span>
+
<span style="background-color:#e7f2fa;color:#2980b9;">lv_obj_t *lv_disp_get_scr_prev(lv_disp_t *disp) </span>
−
: Return with a pointer to the previous scree[https://docs.lvgl.io/8.2/overview/display.html#_CPPv420lv_disp_get_scr_prevP9lv_disp_t]n. Only used during screen transitions.
+
: Return with a pointer to the previous screen. Only used during screen transitions.
−
:; Parameters
+
: '''Parameters'''
−
:: disp -- pointer to display which previous screen should be get. (NULL to use the default screen)
+
:: '''disp''' -- pointer to display which previous screen should be get. (NULL to use the default screen)
−
:; Returns
+
: '''Returns'''
 
:: pointer to the previous screen object or NULL if not used now
 
:: pointer to the previous screen object or NULL if not used now
  
−
; <span id="_CPPv316lv_disp_load_scrP8lv_obj_t"></span><span id="_CPPv216lv_disp_load_scrP8lv_obj_t"></span><span id="lv_disp_load_scr__lv_obj_tP"></span><span id="lv__disp_8h_1a77dbb02b01dd121e3ff923d7a0182341" class="target"></span>void lv_disp_load_scr(lv_obj_t *scr)[https://docs.lvgl.io/8.2/overview/display.html#_CPPv416lv_disp_load_scrP8lv_obj_t] <span id="_CPPv316lv_disp_load_scrP8lv_obj_t"></span><span id="_CPPv216lv_disp_load_scrP8lv_obj_t"></span><span id="lv_disp_load_scr__lv_obj_tP"></span><span id="lv__disp_8h_1a77dbb02b01dd121e3ff923d7a0182341" class="target"></span>
+
<span style="background-color:#e7f2fa;color:#2980b9;">void lv_disp_load_scr(lv_obj_t *scr) </span>
 
: Make a screen active
 
: Make a screen active
−
:; Paramete[https://docs.lvgl.io/8.2/overview/display.html#_CPPv416lv_disp_load_scrP8lv_obj_t]rs
+
: '''Parameters'''
 
:: scr -- pointer to a screen
 
:: scr -- pointer to a screen
  
−
; <span id="_CPPv321lv_disp_get_layer_topP9lv_disp_t"></span><span id="_CPPv221lv_disp_get_layer_topP9lv_disp_t"></span><span id="lv_disp_get_layer_top__lv_disp_tP"></span><span id="lv__disp_8h_1abb96745c10c7d8b5d7acc93e70584145" class="target"></span>lv_obj_t *lv_disp_get_layer_top(lv_disp_t *disp)[https://docs.lvgl.io/8.2/overview/display.html#_CPPv421lv_disp_get_layer_topP9lv_disp_t] <span id="_CPPv321lv_disp_get_layer_topP9lv_disp_t"></span><span id="_CPPv221lv_disp_get_layer_topP9lv_disp_t"></span><span id="lv_disp_get_layer_top__lv_disp_tP"></span><span id="lv__disp_8h_1abb96745c10c7d8b5d7acc93e70584145" class="target"></span>
+
<span style="background-color:#e7f2fa;color:#2980b9;">lv_obj_t *lv_disp_get_layer_top(lv_disp_t *disp) </span>
−
: Return with the top layer. (Same on every sc[https://docs.lvgl.io/8.2/overview/display.html#_CPPv421lv_disp_get_layer_topP9lv_disp_t]reen and it is above the normal screen layer)
+
: Return with the top layer. (Same on every screen and it is above the normal screen layer)
−
:; Parameters
+
: '''Parameters'''
−
:: disp -- pointer to display which top layer should be get. (NULL to use the default screen)
+
:: '''disp''' -- pointer to display which top layer should be get. (NULL to use the default screen)
−
:; Returns
+
: '''Returns'''
 
:: pointer to the top layer object (transparent screen sized lv_obj)
 
:: pointer to the top layer object (transparent screen sized lv_obj)
  
−
; <span id="_CPPv321lv_disp_get_layer_sysP9lv_disp_t"></span><span id="_CPPv221lv_disp_get_layer_sysP9lv_disp_t"></span><span id="lv_disp_get_layer_sys__lv_disp_tP"></span><span id="lv__disp_8h_1ae9a48f536aab873d71c07c313c4e433e" class="target"></span>lv_obj_t *lv_disp_get_layer_sys(lv_disp_t *disp)[https://docs.lvgl.io/8.2/overview/display.html#_CPPv421lv_disp_get_layer_sysP9lv_disp_t] <span id="_CPPv321lv_disp_get_layer_sysP9lv_disp_t"></span><span id="_CPPv221lv_disp_get_layer_sysP9lv_disp_t"></span><span id="lv_disp_get_layer_sys__lv_disp_tP"></span><span id="lv__disp_8h_1ae9a48f536aab873d71c07c313c4e433e" class="target"></span>
+
<span style="background-color:#e7f2fa;color:#2980b9;">lv_obj_t *lv_disp_get_layer_sys(lv_disp_t *disp) </span>
−
: Return with the sys. layer. (Same on every s[https://docs.lvgl.io/8.2/overview/display.html#_CPPv421lv_disp_get_layer_sysP9lv_disp_t]creen and it is above the normal screen and the top layer)
+
: Return with the sys. layer. (Same on every screen and it is above the normal screen and the top layer)
−
:; Parameters
+
: '''Parameters'''
−
:: disp -- pointer to display which sys. layer should be retrieved. (NULL to use the default screen)
+
:: '''disp''' -- pointer to display which sys. layer should be retrieved. (NULL to use the default screen)
−
:; Returns
+
: '''Returns'''
 
:: pointer to the sys layer object (transparent screen sized lv_obj)
 
:: pointer to the sys layer object (transparent screen sized lv_obj)
  
−
; <span id="_CPPv317lv_disp_set_themeP9lv_disp_tP10lv_theme_t"></span><span id="_CPPv217lv_disp_set_themeP9lv_disp_tP10lv_theme_t"></span><span id="lv_disp_set_theme__lv_disp_tP.lv_theme_tP"></span><span id="lv__disp_8h_1a88eb1d18c3ce9dd2de868b5b4c3347af" class="target"></span>void lv_disp_set_theme(lv_disp_t *disp, lv_theme_t *th)[https://docs.lvgl.io/8.2/overview/display.html#_CPPv417lv_disp_set_themeP9lv_disp_tP10lv_theme_t] <span id="_CPPv317lv_disp_set_themeP9lv_disp_tP10lv_theme_t"></span><span id="_CPPv217lv_disp_set_themeP9lv_disp_tP10lv_theme_t"></span><span id="lv_disp_set_theme__lv_disp_tP.lv_theme_tP"></span><span id="lv__disp_8h_1a88eb1d18c3ce9dd2de868b5b4c3347af" class="target"></span>
+
<span style="background-color:#e7f2fa;color:#2980b9;">void lv_disp_set_theme(lv_disp_t *disp, lv_theme_t *th) </span>
 
: Set the theme of a display
 
: Set the theme of a display
−
:; Parameters
+
: '''Parameters'''
−
:: disp --[https://docs.lvgl.io/8.2/overview/display.html#_CPPv417lv_disp_set_themeP9lv_disp_tP10lv_theme_t] pointer to a display
+
:: '''disp''' -- pointer to a display
  
−
; <span id="_CPPv317lv_disp_get_themeP9lv_disp_t"></span><span id="_CPPv217lv_disp_get_themeP9lv_disp_t"></span><span id="lv_disp_get_theme__lv_disp_tP"></span><span id="lv__disp_8h_1ade6752f9389f3e2e6aef5c0413c91934" class="target"></span>lv_theme_t *lv_disp_get_theme(lv_disp_t *disp)[https://docs.lvgl.io/8.2/overview/display.html#_CPPv417lv_disp_get_themeP9lv_disp_t] <span id="_CPPv317lv_disp_get_themeP9lv_disp_t"></span><span id="_CPPv217lv_disp_get_themeP9lv_disp_t"></span><span id="lv_disp_get_theme__lv_disp_tP"></span><span id="lv__disp_8h_1ade6752f9389f3e2e6aef5c0413c91934" class="target"></span>
+
lv_theme_t *lv_disp_get_theme(lv_disp_t *disp)  
 
: Get the theme of a display
 
: Get the theme of a display
−
:; Parameters
+
: '''Parameters'''
−
[https://docs.lvgl.io/8.2/overview/display.html#_CPPv417lv_disp_get_themeP9lv_disp_t]
+
 
−
:: disp -- pointer to a display
+
:: '''disp''' -- pointer to a display
−
:; Returns
+
: '''Returns'''
 
:: the display's theme (can be NULL)
 
:: the display's theme (can be NULL)
  
−
; <span id="_CPPv320lv_disp_set_bg_colorP9lv_disp_t10lv_color_t"></span><span id="_CPPv220lv_disp_set_bg_colorP9lv_disp_t10lv_color_t"></span><span id="lv_disp_set_bg_color__lv_disp_tP.lv_color_t"></span><span id="lv__disp_8h_1aa5d66786eac6c09b625a4ad14c78b5da" class="target"></span>void lv_disp_set_bg_color(lv_disp_t *disp, lv_color_t color)[https://docs.lvgl.io/8.2/overview/display.html#_CPPv420lv_disp_set_bg_colorP9lv_disp_t10lv_color_t] <span id="_CPPv320lv_disp_set_bg_colorP9lv_disp_t10lv_color_t"></span><span id="_CPPv220lv_disp_set_bg_colorP9lv_disp_t10lv_color_t"></span><span id="lv_disp_set_bg_color__lv_disp_tP.lv_color_t"></span><span id="lv__disp_8h_1aa5d66786eac6c09b625a4ad14c78b5da" class="target"></span>
+
<span style="background-color:#e7f2fa;color:#2980b9;">void lv_disp_set_bg_color(lv_disp_t *disp, lv_color_t color) </span>
 
: Set the background color of a display
 
: Set the background color of a display
−
:; Parameters
+
: '''Parameters'''
−
::* [https://docs.lvgl.io/8.2/overview/display.html#_CPPv420lv_disp_set_bg_colorP9lv_disp_t10lv_color_t] disp -- pointer to a display
+
::* '''disp''' -- pointer to a display
−
::* color -- color of the background
+
::* '''color''' -- color of the background
  
−
; <span id="_CPPv320lv_disp_set_bg_imageP9lv_disp_tPKv"></span><span id="_CPPv220lv_disp_set_bg_imageP9lv_disp_tPKv"></span><span id="lv_disp_set_bg_image__lv_disp_tP.voidCP"></span><span id="lv__disp_8h_1ad4726ee5585141717f1a92d78644f9c2" class="target"></span>void lv_disp_set_bg_image(lv_disp_t *disp, const void *img_src)[https://docs.lvgl.io/8.2/overview/display.html#_CPPv420lv_disp_set_bg_imageP9lv_disp_tPKv] <span id="_CPPv320lv_disp_set_bg_imageP9lv_disp_tPKv"></span><span id="_CPPv220lv_disp_set_bg_imageP9lv_disp_tPKv"></span><span id="lv_disp_set_bg_image__lv_disp_tP.voidCP"></span><span id="lv__disp_8h_1ad4726ee5585141717f1a92d78644f9c2" class="target"></span>
+
<span style="background-color:#e7f2fa;color:#2980b9;">void lv_disp_set_bg_image(lv_disp_t *disp, const void *img_src) </span>
 
: Set the background image of a display
 
: Set the background image of a display
−
:; Parameters
+
: '''Parameters'''
−
::* di[https://docs.lvgl.io/8.2/overview/display.html#_CPPv420lv_disp_set_bg_imageP9lv_disp_tPKv]sp -- pointer to a display
+
::* '''disp''' -- pointer to a display
−
::* img_src -- path to file or pointer to an <code>lv_img_dsc_t</code> variable
+
::* '''img_src''' -- path to file or pointer to an <code style="color: #bb0000;">lv_img_dsc_t</code> variable
  
−
; <span id="_CPPv318lv_disp_set_bg_opaP9lv_disp_t8lv_opa_t"></span><span id="_CPPv218lv_disp_set_bg_opaP9lv_disp_t8lv_opa_t"></span><span id="lv_disp_set_bg_opa__lv_disp_tP.lv_opa_t"></span><span id="lv__disp_8h_1a80edf118ea4b29b9267c6df493123ca1" class="target"></span>void lv_disp_set_bg_opa(lv_disp_t *disp, lv_opa_t opa)[https://docs.lvgl.io/8.2/overview/display.html#_CPPv418lv_disp_set_bg_opaP9lv_disp_t8lv_opa_t] <span id="_CPPv318lv_disp_set_bg_opaP9lv_disp_t8lv_opa_t"></span><span id="_CPPv218lv_disp_set_bg_opaP9lv_disp_t8lv_opa_t"></span><span id="lv_disp_set_bg_opa__lv_disp_tP.lv_opa_t"></span><span id="lv__disp_8h_1a80edf118ea4b29b9267c6df493123ca1" class="target"></span>
+
<span style="background-color:#e7f2fa;color:#2980b9;">void lv_disp_set_bg_opa(lv_disp_t *disp, lv_opa_t opa) </span>
 
: Set opacity of the background
 
: Set opacity of the background
−
:; Parameters
+
: '''Parameters'''
−
::* d[https://docs.lvgl.io/8.2/overview/display.html#_CPPv418lv_disp_set_bg_opaP9lv_disp_t8lv_opa_t]isp -- pointer to a display
+
::* '''disp''' -- pointer to a display
−
::* opa -- opacity (0..255)
+
::* '''opa''' -- opacity (0..255)
  
−
; <span id="_CPPv316lv_scr_load_animP8lv_obj_t18lv_scr_load_anim_t8uint32_t8uint32_tb"></span><span id="_CPPv216lv_scr_load_animP8lv_obj_t18lv_scr_load_anim_t8uint32_t8uint32_tb"></span><span id="lv_scr_load_anim__lv_obj_tP.lv_scr_load_anim_t.uint32_t.uint32_t.b"></span><span id="lv__disp_8h_1a34d6349247c52a4c149cabdb1319c8a0" class="target"></span>void lv_scr_load_anim(lv_obj_t *scr, lv_scr_load_anim_t anim_type, uint32_t time, uint32_t delay, bool auto_del)[https://docs.lvgl.io/8.2/overview/display.html#_CPPv416lv_scr_load_animP8lv_obj_t18lv_scr_load_anim_t8uint32_t8uint32_tb] <span id="_CPPv316lv_scr_load_animP8lv_obj_t18lv_scr_load_anim_t8uint32_t8uint32_tb"></span><span id="_CPPv216lv_scr_load_animP8lv_obj_t18lv_scr_load_anim_t8uint32_t8uint32_tb"></span><span id="lv_scr_load_anim__lv_obj_tP.lv_scr_load_anim_t.uint32_t.uint32_t.b"></span><span id="lv__disp_8h_1a34d6349247c52a4c149cabdb1319c8a0" class="target"></span>
+
<span style="background-color:#e7f2fa;color:#2980b9;">void lv_scr_load_anim(lv_obj_t *scr, lv_scr_load_anim_t anim_type, uint32_t time, uint32_t delay, bool auto_del) </span>
 
: Switch screen with animation
 
: Switch screen with animation
−
:; Parameters
+
: '''Parameters'''
−
::* scr -- pointer to the new screen to load
+
::* '''scr''' -- pointer to the new screen to load
−
::* anim_type -- typ[https://docs.lvgl.io/8.2/overview/display.html#_CPPv416lv_scr_load_animP8lv_obj_t18lv_scr_load_anim_t8uint32_t8uint32_tb]e of the animation from <code>lv_scr_load_anim_t</code>. E.g. <code>LV_SCR_LOAD_ANIM_MOVE_LEFT</code>
+
::* '''anim_type''' -- type of the animation from <code style="color: #bb0000;">lv_scr_load_anim_t</code>. E.g. <code style="color: #bb0000;">LV_SCR_LOAD_ANIM_MOVE_LEFT</code>
−
::* time -- time of the animation
+
::* '''time''' -- time of the animation
−
::* delay -- delay before the transition
+
::* '''delay''' -- delay before the transition
−
::* auto_del -- true: automatically delete the old screen
+
::* '''auto_del''' -- true: automatically delete the old screen
  
−
; <span id="_CPPv325lv_disp_get_inactive_timePK9lv_disp_t"></span><span id="_CPPv225lv_disp_get_inactive_timePK9lv_disp_t"></span><span id="lv_disp_get_inactive_time__lv_disp_tCP"></span><span id="lv__disp_8h_1a4ae9136128a901bf5b37f23672842f0d" class="target"></span>uint32_t lv_disp_get_inactive_time(const lv_disp_t *disp)[https://docs.lvgl.io/8.2/overview/display.html#_CPPv425lv_disp_get_inactive_timePK9lv_disp_t] <span id="_CPPv325lv_disp_get_inactive_timePK9lv_disp_t"></span><span id="_CPPv225lv_disp_get_inactive_timePK9lv_disp_t"></span><span id="lv_disp_get_inactive_time__lv_disp_tCP"></span><span id="lv__disp_8h_1a4ae9136128a901bf5b37f23672842f0d" class="target"></span>
+
<span style="background-color:#e7f2fa;color:#2980b9;">uint32_t lv_disp_get_inactive_time(const lv_disp_t *disp) </span>
−
: Get elapsed time since last user activity on a displa[https://docs.lvgl.io/8.2/overview/display.html#_CPPv425lv_disp_get_inactive_timePK9lv_disp_t]y (e.g. click)
+
: Get elapsed time since last user activity on a display (e.g. click)
−
:; Parameters
+
: '''Parameters'''
−
:: disp -- pointer to a display (NULL to get the overall smallest inactivity)
+
:: '''disp''' -- pointer to a display (NULL to get the overall smallest inactivity)
−
:; Returns
+
: '''Returns'''
 
:: elapsed ticks (milliseconds) since the last activity
 
:: elapsed ticks (milliseconds) since the last activity
  
−
; <span id="_CPPv321lv_disp_trig_activityP9lv_disp_t"></span><span id="_CPPv221lv_disp_trig_activityP9lv_disp_t"></span><span id="lv_disp_trig_activity__lv_disp_tP"></span><span id="lv__disp_8h_1a44083753547903dc975e6ec29b4ea280" class="target"></span>void lv_disp_trig_activity(lv_disp_t *disp)[https://docs.lvgl.io/8.2/overview/display.html#_CPPv421lv_disp_trig_activityP9lv_disp_t] <span id="_CPPv321lv_disp_trig_activityP9lv_disp_t"></span><span id="_CPPv221lv_disp_trig_activityP9lv_disp_t"></span><span id="lv_disp_trig_activity__lv_disp_tP"></span><span id="lv__disp_8h_1a44083753547903dc975e6ec29b4ea280" class="target"></span>
+
<span style="background-color:#e7f2fa;color:#2980b9;">void lv_disp_trig_activity(lv_disp_t *disp) </span>
−
: Manually trigger an activity on a displ[https://docs.lvgl.io/8.2/overview/display.html#_CPPv421lv_disp_trig_activityP9lv_disp_t]ay
+
: Manually trigger an activity on a display
−
:; Parameters
+
: '''Parameters'''
−
:: disp -- pointer to a display (NULL to use the default display)
+
:: '''disp''' -- pointer to a display (NULL to use the default display)
  
−
; <span id="_CPPv320lv_disp_clean_dcacheP9lv_disp_t"></span><span id="_CPPv220lv_disp_clean_dcacheP9lv_disp_t"></span><span id="lv_disp_clean_dcache__lv_disp_tP"></span><span id="lv__disp_8h_1a3a3770903c53e8d7fbf47555bfdb152b" class="target"></span>void lv_disp_clean_dcache(lv_disp_t *disp)[https://docs.lvgl.io/8.2/overview/display.html#_CPPv420lv_disp_clean_dcacheP9lv_disp_t] <span id="_CPPv320lv_disp_clean_dcacheP9lv_disp_t"></span><span id="_CPPv220lv_disp_clean_dcacheP9lv_disp_t"></span><span id="lv_disp_clean_dcache__lv_disp_tP"></span><span id="lv__disp_8h_1a3a3770903c53e8d7fbf47555bfdb152b" class="target"></span>
+
<span style="background-color:#e7f2fa;color:#2980b9;">void lv_disp_clean_dcache(lv_disp_t *disp) </span>
−
: Clean any CPU cache that is related to[https://docs.lvgl.io/8.2/overview/display.html#_CPPv420lv_disp_clean_dcacheP9lv_disp_t] the display.
+
: Clean any CPU cache that is related to the display.
−
:; Parameters
+
: '''Parameters'''
−
:: disp -- pointer to a display (NULL to use the default display)
+
:: '''disp''' -- pointer to a display (NULL to use the default display)
  
−
; <span id="_CPPv323_lv_disp_get_refr_timerP9lv_disp_t"></span><span id="_CPPv223_lv_disp_get_refr_timerP9lv_disp_t"></span><span id="_lv_disp_get_refr_timer__lv_disp_tP"></span><span id="lv__disp_8h_1ac7a44c2ea827ab4174a0a1a706d065c2" class="target"></span>lv_timer_t *_lv_disp_get_refr_timer(lv_disp_t *disp)[https://docs.lvgl.io/8.2/overview/display.html#_CPPv423_lv_disp_get_refr_timerP9lv_disp_t] <span id="_CPPv323_lv_disp_get_refr_timerP9lv_disp_t"></span><span id="_CPPv223_lv_disp_get_refr_timerP9lv_disp_t"></span><span id="_lv_disp_get_refr_timer__lv_disp_tP"></span><span id="lv__disp_8h_1ac7a44c2ea827ab4174a0a1a706d065c2" class="target"></span>
+
<span style="background-color:#e7f2fa;color:#2980b9;">lv_timer_t *_lv_disp_get_refr_timer(lv_disp_t *disp) </span>
−
: Get a pointer to the screen refresher timer to m[https://docs.lvgl.io/8.2/overview/display.html#_CPPv423_lv_disp_get_refr_timerP9lv_disp_t]odify its parameters with <code>lv_timer_...</code> functions.
+
: Get a pointer to the screen refresher timer to modify its parameters with <code style="color: #bb0000;">lv_timer_...</code> functions.
−
:; Parameters
+
: '''Parameters'''
−
:: disp -- pointer to a display
+
:: '''disp''' -- pointer to a display
−
:; Returns
+
: '''Returns'''
 
:: pointer to the display refresher timer. (NULL on error)
 
:: pointer to the display refresher timer. (NULL on error)
  
−
; <span id="_CPPv310lv_scr_actv"></span><span id="_CPPv210lv_scr_actv"></span><span id="lv_scr_act__void"></span><span id="lv__disp_8h_1a4e716d4e070c3b0ab848d277a4d6704c" class="target"></span>static inline lv_obj_t *lv_scr_act(void)[https://docs.lvgl.io/8.2/overview/display.html#_CPPv410lv_scr_actv] <span id="_CPPv310lv_scr_actv"></span><span id="_CPPv210lv_scr_actv"></span><span id="lv_scr_act__void"></span><span id="lv__disp_8h_1a4e716d4e070c3b0ab848d277a4d6704c" class="target"></span>
+
<span style="background-color:#e7f2fa;color:#2980b9;">static inline lv_obj_t *lv_scr_act(void) </span>
−
: Get the active screen of the default[https://docs.lvgl.io/8.2/overview/display.html#_CPPv410lv_scr_actv] display
+
: Get the active screen of the default display
−
:; Returns
+
: '''Returns'''
 
:: pointer to the active screen
 
:: pointer to the active screen
  
−
; <span id="_CPPv312lv_layer_topv"></span><span id="_CPPv212lv_layer_topv"></span><span id="lv_layer_top__void"></span><span id="lv__disp_8h_1a04b984c1db6bb83548ea1b1858422345" class="target"></span>static inline lv_obj_t *lv_layer_top(void)[https://docs.lvgl.io/8.2/overview/display.html#_CPPv412lv_layer_topv] <span id="_CPPv312lv_layer_topv"></span><span id="_CPPv212lv_layer_topv"></span><span id="lv_layer_top__void"></span><span id="lv__disp_8h_1a04b984c1db6bb83548ea1b1858422345" class="target"></span>
+
<span style="background-color:#e7f2fa;color:#2980b9;">static inline lv_obj_t *lv_layer_top(void) </span>
−
: Get the top layer of the default displ[https://docs.lvgl.io/8.2/overview/display.html#_CPPv412lv_layer_topv]ay
+
: Get the top layer of the default display
−
:; Returns
+
: '''Returns'''
 
:: pointer to the top layer
 
:: pointer to the top layer
  
−
; <span id="_CPPv312lv_layer_sysv"></span><span id="_CPPv212lv_layer_sysv"></span><span id="lv_layer_sys__void"></span><span id="lv__disp_8h_1ac4f26a96ade3c25c46c7f79f6f767ce4" class="target"></span>static inline lv_obj_t *lv_layer_sys(void)[https://docs.lvgl.io/8.2/overview/display.html#_CPPv412lv_layer_sysv] <span id="_CPPv312lv_layer_sysv"></span><span id="_CPPv212lv_layer_sysv"></span><span id="lv_layer_sys__void"></span><span id="lv__disp_8h_1ac4f26a96ade3c25c46c7f79f6f767ce4" class="target"></span>
+
<span style="background-color:#e7f2fa;color:#2980b9;">static inline lv_obj_t *lv_layer_sys(void) </span>
−
: Get the active screen of the default d[https://docs.lvgl.io/8.2/overview/display.html#_CPPv412lv_layer_sysv]isplay
+
: Get the active screen of the default display
−
:; Returns
+
: '''Returns'''
 
:: pointer to the sys layer
 
:: pointer to the sys layer
  
−
; <span id="_CPPv311lv_scr_loadP8lv_obj_t"></span><span id="_CPPv211lv_scr_loadP8lv_obj_t"></span><span id="lv_scr_load__lv_obj_tP"></span><span id="lv__disp_8h_1a14a1792cf92d6c3fbdc62b154cb54023" class="target"></span>static inline void lv_scr_load(lv_obj_t *scr)[https://docs.lvgl.io/8.2/overview/display.html#_CPPv411lv_scr_loadP8lv_obj_t] <span id="_CPPv311lv_scr_loadP8lv_obj_t"></span><span id="_CPPv211lv_scr_loadP8lv_obj_t"></span><span id="lv_scr_load__lv_obj_tP"></span><span id="lv__disp_8h_1a14a1792cf92d6c3fbdc62b154cb54023" class="target"></span>
+
<span style="background-color:#e7f2fa;color:#2980b9;">static inline void lv_scr_load(lv_obj_t *scr) </span>
 
:
 
:
  
−
; <span id="_CPPv36lv_dpx10lv_coord_t"></span><span id="_CPPv26lv_dpx10lv_coord_t"></span><span id="lv_dpx__lv_coord_t"></span><span id="lv__disp_8h_1ad8d0e384a4d60fefbe4682535f766628" class="target"></span>static inline lv_coord_t lv_dpx(lv_[https://docs.lvgl.io/8.2/overview/display.html#_CPPv411lv_scr_loadP8lv_obj_t]coord_t n)[https://docs.lvgl.io/8.2/overview/display.html#_CPPv46lv_dpx10lv_coord_t] <span id="_CPPv36lv_dpx10lv_coord_t"></span><span id="_CPPv26lv_dpx10lv_coord_t"></span><span id="lv_dpx__lv_coord_t"></span><span id="lv__disp_8h_1ad8d0e384a4d60fefbe4682535f766628" class="target"></span>
+
static inline lv_coord_t lv_dpx(lv_coord_t n)  
−
: Scale the given number of pixels (a dista[https://docs.lvgl.io/8.2/overview/display.html#_CPPv46lv_dpx10lv_coord_t]nce or size) relative to a 160 DPI display considering the DPI of the default display. It ensures that e.g. <code>lv_dpx(100)</code> will have the same physical size regardless to the DPI of the display.
+
: Scale the given number of pixels (a distance or size) relative to a 160 DPI display considering the DPI of the default display. It ensures that e.g. <code style="color: #bb0000;">lv_dpx(100)</code> will have the same physical size regardless to the DPI of the display.
−
:; Parameters
+
: '''Parameters'''
 
:: n -- the number of pixels to scale
 
:: n -- the number of pixels to scale
−
:; Returns
+
: '''Returns'''
−
:: <code>n x current_dpi/160</code>
+
:: <code style="color: #bb0000;">n x current_dpi/160</code>
  
−
; <span id="_CPPv311lv_disp_dpxPK9lv_disp_t10lv_coord_t"></span><span id="_CPPv211lv_disp_dpxPK9lv_disp_t10lv_coord_t"></span><span id="lv_disp_dpx__lv_disp_tCP.lv_coord_t"></span><span id="lv__disp_8h_1a5a5f23760a6625483500522546b659c6" class="target"></span>static inline lv_coord_t lv_disp_dpx(const lv_disp_t *disp, lv_coord_t n)[https://docs.lvgl.io/8.2/overview/display.html#_CPPv411lv_disp_dpxPK9lv_disp_t10lv_coord_t] <span id="_CPPv311lv_disp_dpxPK9lv_disp_t10lv_coord_t"></span><span id="_CPPv211lv_disp_dpxPK9lv_disp_t10lv_coord_t"></span><span id="lv_disp_dpx__lv_disp_tCP.lv_coord_t"></span><span id="lv__disp_8h_1a5a5f23760a6625483500522546b659c6" class="target"></span>
+
<span style="background-color:#e7f2fa;color:#2980b9;">static inline lv_coord_t lv_disp_dpx(const lv_disp_t *disp, lv_coord_t n) </span>
−
: Scale the given number of pixels (a distance or size) relative to a 1[https://docs.lvgl.io/8.2/overview/display.html#_CPPv411lv_disp_dpxPK9lv_disp_t10lv_coord_t]60 DPI display considering the DPI of the given display. It ensures that e.g. <code>lv_dpx(100)</code> will have the same physical size regardless to the DPI of the display.
+
: Scale the given number of pixels (a distance or size) relative to a 160 DPI display considering the DPI of the given display. It ensures that e.g. <code style="color: #bb0000;">lv_dpx(100)</code> will have the same physical size regardless to the DPI of the display.
−
:; Parameters
+
: '''Parameters'''
 
::* obj -- a display whose dpi should be considered
 
::* obj -- a display whose dpi should be considered
 
::* n -- the number of pixels to scale
 
::* n -- the number of pixels to scale
−
:; Returns
+
: '''Returns'''
−
:: <code>n x current_dpi/160</code>
+
:: <code style="color: #bb0000;">n x current_dpi/160</code>
−
 
+
|
−
 
+
|}
−
 
 
−
 
 
−
 
 
−
 
 
−
 
 
−
 
 
  
  
  
 
:[[App:Library:LVGL#Overview|戻る : Previous]]
 
:[[App:Library:LVGL#Overview|戻る : Previous]]

2022年7月1日 (金) 11:58時点における版

https://docs.lvgl.io/8.2/overview/display.html

Displays

英文 自動翻訳

Important

The basic concept of a display in LVGL is explained in the [Porting](/porting/display) section. So before reading further, please read the [Porting](/porting/display) section first.

戻る : Previous


Multiple display support

英文 自動翻訳

In LVGL you can have multiple displays, each with their own driver and objects. The only limitation is that every display needs to have the same color depth (as defined in LV_COLOR_DEPTH). If the displays are different in this regard the rendered image can be converted to the correct format in the drivers flush_cb.

Creating more displays is easy: just initialize more display buffers and register another driver for every display. When you create the UI, use lv_disp_set_default(disp) to tell the library on which display to create objects.

Why would you want multi-display support? Here are some examples:

  • Have a "normal" TFT display with local UI and create "virtual" screens on VNC on demand. (You need to add your VNC driver).
  • Have a large TFT display and a small monochrome display.
  • Have some smaller and simple displays in a large instrument or technology.
  • Have two large TFT displays: one for a customer and one for the shop assistant.
戻る : Previous


Using only one display

英文 自動翻訳

Using more displays can be useful but in most cases it's not required. Therefore, the whole concept of multi-display handling is completely hidden if you register only one display. By default, the last created (and only) display is used.

lv_scr_act(), lv_scr_load(scr), lv_layer_top(), lv_layer_sys(), LV_HOR_RES and LV_VER_RES are always applied on the most recently created (default) display. If you pass NULL as disp parameter to display related functions the default display will usually be used. E.g. lv_disp_trig_activity(NULL) will trigger a user activity on the default display. (See below in Inactivity).

戻る : Previous


Mirror display

英文 自動翻訳

To mirror the image of a display to another display, you don't need to use multi-display support. Just transfer the buffer received in drv.flush_cb to the other display too.

戻る : Previous


Split image

英文 自動翻訳

You can create a larger virtual display from an array of smaller ones. You can create it as below:

  1. Set the resolution of the displays to the large display's resolution.
  2. In drv.flush_cb, truncate and modify the area parameter for each display.
  3. Send the buffer's content to each real display with the truncated area.
戻る : Previous


Screens

英文 自動翻訳

Every display has its own set of screens and the objects on each screen.

Be sure not to confuse displays and screens:

  • Displays are the physical hardware drawing the pixels.
  • Screens are the high-level root objects associated with a particular display. One display can have multiple screens associated with it, but not vice versa.

Screens can be considered the highest level containers which have no parent. A screen's size is always equal to its display and their origin is (0;0). Therefore, a screen's coordinates can't be changed, i.e. lv_obj_set_pos(), lv_obj_set_size() or similar functions can't be used on screens.

A screen can be created from any object type but the two most typical types are Base object and Image (to create a wallpaper).

To create a screen, use lv_obj_t * scr = lv_<type>_create(NULL, copy). copy can be an existing screen copied into the new screen.

To load a screen, use lv_scr_load(scr). To get the active screen, use lv_scr_act(). These functions work on the default display. If you want to specify which display to work on, use lv_disp_get_scr_act(disp) and lv_disp_load_scr(disp, scr). A screen can be loaded with animations too. Read more here.

Screens can be deleted with lv_obj_del(scr), but ensure that you do not delete the currently loaded screen.

戻る : Previous


Transparent screens

英文 自動翻訳

Usually, the opacity of the screen is LV_OPA_COVER to provide a solid background for its children. If this is not the case (opacity < 100%) the display's background color or image will be visible. See the Display background section for more details. If the display's background opacity is also not LV_OPA_COVER LVGL has no solid background to draw.

This configuration (transparent screen and display) could be used to create for example OSD menus where a video is played on a lower layer, and a menu is overlayed on an upper layer.

To handle transparent displays, special (slower) color mixing algorithms need to be used by LVGL so this feature needs to enabled with LV_COLOR_SCREEN_TRANSP in lv_conf.h. As this mode operates on the Alpha channel of the pixels LV_COLOR_DEPTH = 32 is also required. The Alpha channel of 32-bit colors will be 0 where there are no objects and 255 where there are solid objects.

In summary, to enable transparent screens and displays for OSD menu-like UIs:

  • Enable LV_COLOR_SCREEN_TRANSP in lv_conf.h
  • Be sure to use LV_COLOR_DEPTH 32
  • Set the screen's opacity to LV_OPA_TRANSP e.g. with lv_obj_set_style_local_bg_opa(lv_scr_act(), LV_OBJMASK_PART_MAIN, LV_STATE_DEFAULT, LV_OPA_TRANSP)
  • Set the display opacity to LV_OPA_TRANSP with lv_disp_set_bg_opa(NULL, LV_OPA_TRANSP);
戻る : Previous


Features of displays

Inactivity

英文 自動翻訳

A user's inactivity time is measured on each display. Every use of an Input device (if associated with the display) counts as an activity. To get time elapsed since the last activity, use lv_disp_get_inactive_time(disp). If NULL is passed, the lowest inactivity time among all displays will be returned (NULL isn't just the default display).

You can manually trigger an activity using lv_disp_trig_activity(disp). If disp is NULL, the default screen will be used (and not all displays).

戻る : Previous


Background

英文 自動翻訳

Every display has a background color, background image and background opacity properties. They become visible when the current screen is transparent or not positioned to cover the whole display.

The background color is a simple color to fill the display. It can be adjusted with lv_disp_set_bg_color(disp, color);

The display background image is a path to a file or a pointer to an lv_img_dsc_t variable (converted image data) to be used as wallpaper. It can be set with lv_disp_set_bg_image(disp, &my_img); If a background image is configured the background won't be filled with bg_color.

The opacity of the background color or image can be adjusted with lv_disp_set_bg_opa(disp, opa).

The disp parameter of these functions can be NULL to select the default display.

戻る : Previous


API

英文 自動翻訳

Enums

enum lv_scr_load_anim_t

Values:
enumerator LV_SCR_LOAD_ANIM_NONE
enumerator LV_SCR_LOAD_ANIM_OVER_LEFT
enumerator LV_SCR_LOAD_ANIM_OVER_RIGHT
enumerator LV_SCR_LOAD_ANIM_OVER_TOP
enumerator LV_SCR_LOAD_ANIM_OVER_BOTTOM
enumerator LV_SCR_LOAD_ANIM_MOVE_LEFT
enumerator LV_SCR_LOAD_ANIM_MOVE_RIGHT
enumerator LV_SCR_LOAD_ANIM_MOVE_TOP
enumerator LV_SCR_LOAD_ANIM_MOVE_BOTTOM
enumerator LV_SCR_LOAD_ANIM_FADE_ON

Functions

lv_obj_t *lv_disp_get_scr_act(lv_disp_t *disp)

Return with a pointer to the active screen
Parameters
disp -- pointer to display which active screen should be get. (NULL to use the default screen)
Returns
pointer to the active screen object (loaded by 'lv_scr_load()')

lv_obj_t *lv_disp_get_scr_prev(lv_disp_t *disp)

Return with a pointer to the previous screen. Only used during screen transitions.
Parameters
disp -- pointer to display which previous screen should be get. (NULL to use the default screen)
Returns
pointer to the previous screen object or NULL if not used now

void lv_disp_load_scr(lv_obj_t *scr)

Make a screen active
Parameters
scr -- pointer to a screen

lv_obj_t *lv_disp_get_layer_top(lv_disp_t *disp)

Return with the top layer. (Same on every screen and it is above the normal screen layer)
Parameters
disp -- pointer to display which top layer should be get. (NULL to use the default screen)
Returns
pointer to the top layer object (transparent screen sized lv_obj)

lv_obj_t *lv_disp_get_layer_sys(lv_disp_t *disp)

Return with the sys. layer. (Same on every screen and it is above the normal screen and the top layer)
Parameters
disp -- pointer to display which sys. layer should be retrieved. (NULL to use the default screen)
Returns
pointer to the sys layer object (transparent screen sized lv_obj)

void lv_disp_set_theme(lv_disp_t *disp, lv_theme_t *th)

Set the theme of a display
Parameters
disp -- pointer to a display

lv_theme_t *lv_disp_get_theme(lv_disp_t *disp)

Get the theme of a display
Parameters
disp -- pointer to a display
Returns
the display's theme (can be NULL)

void lv_disp_set_bg_color(lv_disp_t *disp, lv_color_t color)

Set the background color of a display
Parameters
  • disp -- pointer to a display
  • color -- color of the background

void lv_disp_set_bg_image(lv_disp_t *disp, const void *img_src)

Set the background image of a display
Parameters
  • disp -- pointer to a display
  • img_src -- path to file or pointer to an lv_img_dsc_t variable

void lv_disp_set_bg_opa(lv_disp_t *disp, lv_opa_t opa)

Set opacity of the background
Parameters
  • disp -- pointer to a display
  • opa -- opacity (0..255)

void lv_scr_load_anim(lv_obj_t *scr, lv_scr_load_anim_t anim_type, uint32_t time, uint32_t delay, bool auto_del)

Switch screen with animation
Parameters
  • scr -- pointer to the new screen to load
  • anim_type -- type of the animation from lv_scr_load_anim_t. E.g. LV_SCR_LOAD_ANIM_MOVE_LEFT
  • time -- time of the animation
  • delay -- delay before the transition
  • auto_del -- true: automatically delete the old screen

uint32_t lv_disp_get_inactive_time(const lv_disp_t *disp)

Get elapsed time since last user activity on a display (e.g. click)
Parameters
disp -- pointer to a display (NULL to get the overall smallest inactivity)
Returns
elapsed ticks (milliseconds) since the last activity

void lv_disp_trig_activity(lv_disp_t *disp)

Manually trigger an activity on a display
Parameters
disp -- pointer to a display (NULL to use the default display)

void lv_disp_clean_dcache(lv_disp_t *disp)

Clean any CPU cache that is related to the display.
Parameters
disp -- pointer to a display (NULL to use the default display)

lv_timer_t *_lv_disp_get_refr_timer(lv_disp_t *disp)

Get a pointer to the screen refresher timer to modify its parameters with lv_timer_... functions.
Parameters
disp -- pointer to a display
Returns
pointer to the display refresher timer. (NULL on error)

static inline lv_obj_t *lv_scr_act(void)

Get the active screen of the default display
Returns
pointer to the active screen

static inline lv_obj_t *lv_layer_top(void)

Get the top layer of the default display
Returns
pointer to the top layer

static inline lv_obj_t *lv_layer_sys(void)

Get the active screen of the default display
Returns
pointer to the sys layer

static inline void lv_scr_load(lv_obj_t *scr)

static inline lv_coord_t lv_dpx(lv_coord_t n)

Scale the given number of pixels (a distance or size) relative to a 160 DPI display considering the DPI of the default display. It ensures that e.g. lv_dpx(100) will have the same physical size regardless to the DPI of the display.
Parameters
n -- the number of pixels to scale
Returns
n x current_dpi/160

static inline lv_coord_t lv_disp_dpx(const lv_disp_t *disp, lv_coord_t n)

Scale the given number of pixels (a distance or size) relative to a 160 DPI display considering the DPI of the given display. It ensures that e.g. lv_dpx(100) will have the same physical size regardless to the DPI of the display.
Parameters
  • obj -- a display whose dpi should be considered
  • n -- the number of pixels to scale
Returns
n x current_dpi/160


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