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68 lines
2.3 KiB
Markdown
68 lines
2.3 KiB
Markdown
2 years ago
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# Message box (lv_msgbox)
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## Overview
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The Message boxes act as pop-ups.
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They are built from a background container, a title, an optional close button, a text and optional buttons.
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The text will be broken into multiple lines automatically and the height will be set automatically to include the text and the buttons.
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The message box can be modal (blocking clicks on the rest of the screen) or not modal.
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## Parts and Styles
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The message box is built from other widgets, so you can check these widgets' documentation for details.
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- Background: [lv_obj](/widgets/obj)
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- Close button: [lv_btn](/widgets/core/btn)
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- Title and text: [lv_label](/widgets/core/label)
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- Buttons: [lv_btnmatrix](/widgets/core/btnmatrix)
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## Usage
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### Create a message box
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`lv_msgbox_create(parent, title, txt, btn_txts[], add_close_btn)` creates a message box.
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If `parent` is `NULL` the message box will be modal. `title` and `txt` are strings for the title and the text.
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`btn_txts[]` is an array with the buttons' text. E.g. `const char * btn_txts[] = {"Ok", "Cancel", NULL}`.
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`add_close_btn` can be `true` or `false` to add/don't add a close button.
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### Get the parts
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The building blocks of the message box can be obtained using the following functions:
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```c
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lv_obj_t * lv_msgbox_get_title(lv_obj_t * mbox);
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lv_obj_t * lv_msgbox_get_close_btn(lv_obj_t * mbox);
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lv_obj_t * lv_msgbox_get_text(lv_obj_t * mbox);
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lv_obj_t * lv_msgbox_get_btns(lv_obj_t * mbox);
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```
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### Close the message box
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`lv_msgbox_close(msgbox)` closes (deletes) the message box.
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## Events
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- `LV_EVENT_VALUE_CHANGED` is sent by the buttons if one of them is clicked. `LV_OBJ_FLAG_EVENT_BUBBLE` is enabled on the buttons so you can add events to the message box itself.
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In the event handler, `lv_event_get_target(e)` will return the button matrix and `lv_event_get_current_target(e)` will return the message box. `lv_msgbox_get_active_btn(msgbox)` and `lv_msgbox_get_active_btn_text(msgbox)` can be used to get the index and text of the clicked button.
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Learn more about [Events](/overview/event).
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## Keys
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Keys have effect on the close button and button matrix. You can add them manually to a group if required.
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Learn more about [Keys](/overview/indev).
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## Example
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```eval_rst
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.. include:: ../../../examples/widgets/msgbox/index.rst
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```
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## API
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```eval_rst
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.. doxygenfile:: lv_msgbox.h
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:project: lvgl
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```
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