Window (lv_win)¶
Overview¶
The Window is container-like object built from a header with title and buttons and a content area.
Parts and Styles¶
The Window is built from other widgets so you can check their documentation for details:
Usage¶
Create a Window¶
lv_win_create(parent, header_height) creates a Window with an empty header.
Title and buttons¶
Any number of texts (but typically only one) can be added to the header with lv_win_add_title(win, "The title").
Control buttons can be added to the window's header with lv_win_add_btn(win, icon, btn_width). icon can be any image source, and btn_width is the width of the button.
The title and the buttons will be added in the order the functions are called. So adding a button, a text and two other buttons will result in a button on the left, a title, and 2 buttons on the right. The width of the title is set to take all the remaining space on the header. In other words: it pushes to the right all the buttons that are added after the title.
Get the parts¶
lv_win_get_header(win) returns a pointer to the header, lv_win_get_content(win) returns a pointer to the content container to which the content of the window can be added.
Events¶
No special events are sent by the windows, however events can be added manually to the return value of lv_win_add_btn.
Learn more about Events.
Example¶
Simple window¶
C code
GitHub#include "../../lv_examples.h"
#if LV_USE_WIN && LV_BUILD_EXAMPLES
static void event_handler(lv_event_t * e)
{
lv_obj_t * obj = lv_event_get_target(e);
LV_LOG_USER("Button %d clicked", (int)lv_obj_get_index(obj));
}
void lv_example_win_1(void)
{
lv_obj_t * win = lv_win_create(lv_scr_act(), 40);
lv_obj_t * btn;
btn = lv_win_add_btn(win, LV_SYMBOL_LEFT, 40);
lv_obj_add_event_cb(btn, event_handler, LV_EVENT_CLICKED, NULL);
lv_win_add_title(win, "A title");
btn = lv_win_add_btn(win, LV_SYMBOL_RIGHT, 40);
lv_obj_add_event_cb(btn, event_handler, LV_EVENT_CLICKED, NULL);
btn = lv_win_add_btn(win, LV_SYMBOL_CLOSE, 60);
lv_obj_add_event_cb(btn, event_handler, LV_EVENT_CLICKED, NULL);
lv_obj_t * cont = lv_win_get_content(win); /*Content can be added here*/
lv_obj_t * label = lv_label_create(cont);
lv_label_set_text(label, "This is\n"
"a pretty\n"
"long text\n"
"to see how\n"
"the window\n"
"becomes\n"
"scrollable.\n"
"\n"
"\n"
"Some more\n"
"text to be\n"
"sure it\n"
"overflows. :)");
}
#endif
def event_handler(e):
code = e.get_code()
obj = e.get_target()
if code == lv.EVENT.CLICKED:
print("Button {:d} clicked".format(obj.get_child_id()))
win = lv.win(lv.scr_act(), 60)
btn1 = win.add_btn(lv.SYMBOL.LEFT, 40)
btn1.add_event_cb(event_handler, lv.EVENT.ALL, None)
win.add_title("A title")
btn2=win.add_btn(lv.SYMBOL.RIGHT, 40)
btn2.add_event_cb(event_handler, lv.EVENT.ALL, None)
btn3 = win.add_btn(lv.SYMBOL.CLOSE, 60)
btn3.add_event_cb(event_handler, lv.EVENT.ALL, None)
cont = win.get_content() # Content can be added here
label = lv.label(cont)
label.set_text("""This is
a pretty
long text
to see how
the window
becomes
scrollable.
We need
quite some text
and we will
even put
some more
text to be
sure it
overflows.
""")