A39模拟器

MXC-A39/lvgl/examples/widgets/msgbox/index.rst

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+C
+^
+
+Simple Message box 
+"""""""""""""""""""
+
+.. lv_example:: widgets/msgbox/lv_example_msgbox_1
+  :language: c
+
+
+MicroPython
+^^^^^^^^^^^
+
+No examples yet.

MXC-A39/lvgl/examples/widgets/msgbox/lv_example_msgbox_1.c

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+#include "../../lv_examples.h"
+#if LV_USE_MSGBOX && LV_BUILD_EXAMPLES
+
+static void event_cb(lv_event_t * e)
+{
+    lv_obj_t * obj = lv_event_get_current_target(e);
+    LV_LOG_USER("Button %s clicked", lv_msgbox_get_active_btn_text(obj));
+}
+
+void lv_example_msgbox_1(void)
+{
+    static const char * btns[] ={"Apply", "Close", ""};
+
+    lv_obj_t * mbox1 = lv_msgbox_create(NULL, "Hello", "This is a message box with two buttons.", btns, true);
+    lv_obj_add_event_cb(mbox1, event_cb, LV_EVENT_VALUE_CHANGED, NULL);
+    lv_obj_center(mbox1);
+}
+
+#endif

MXC-A39/lvgl/examples/widgets/msgbox/lv_example_msgbox_1.py

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+def event_handler(obj, event):
+    if event == lv.EVENT.VALUE_CHANGED:
+        print("Button: %s" % lv.mbox.get_active_btn_text(obj))
+
+btns = ["Apply", "Close", ""]
+
+mbox1 = lv.mbox(lv.scr_act())
+mbox1.set_text("A message box with two buttons.");
+mbox1.add_btns(btns)
+mbox1.set_width(200)
+mbox1.set_event_cb(event_handler)
+mbox1.align(None, lv.ALIGN.CENTER, 0, 0)  # Align to the corner

MXC-A39/lvgl/examples/widgets/msgbox/lv_example_msgbox_2.py

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+welcome_info = "Welcome to the modal message box demo!\nPress the button to display a message box."
+in_msg_info = "Notice that you cannot touch the button again while the message box is open."
+
+class Modal(lv.mbox):
+    """mbox with semi-transparent background"""
+    def __init__(self, parent, *args, **kwargs):
+        # Create a full-screen background
+        modal_style = lv.style_t()
+        lv.style_copy(modal_style, lv.style_plain_color)
+        # Set the background's style
+        modal_style.body.main_color = modal_style.body.grad_color = lv.color_make(0,0,0)
+        modal_style.body.opa = lv.OPA._50
+        
+        # Create a base object for the modal background
+        self.bg = lv.obj(parent)
+        self.bg.set_style(modal_style)
+        self.bg.set_pos(0, 0)
+        self.bg.set_size(parent.get_width(), parent.get_height())
+        self.bg.set_opa_scale_enable(True)  # Enable opacity scaling for the animation
+
+        super().__init__(self.bg, *args, **kwargs)
+        self.align(None, lv.ALIGN.CENTER, 0, 0)
+
+        # Fade the message box in with an animation
+        a = lv.anim_t()
+        lv.anim_init(a)
+        lv.anim_set_time(a, 500, 0)
+        lv.anim_set_values(a, lv.OPA.TRANSP, lv.OPA.COVER)
+        lv.anim_set_exec_cb(a, self.bg, lv.obj.set_opa_scale)
+        lv.anim_create(a)
+        super().set_event_cb(self.default_callback)
+
+    def set_event_cb(self, callback):
+        self.callback = callback
+
+    def get_event_cb(self):
+        return self.callback
+
+    def default_callback(self, obj, evt):
+        if evt == lv.EVENT.DELETE:# and obj == self:
+            # Delete the parent modal background
+            self.get_parent().del_async()
+        elif evt == lv.EVENT.VALUE_CHANGED:
+            # A button was clicked
+            self.start_auto_close(0)
+        # Call user-defined callback
+        if self.callback is not None:
+            self.callback(obj, evt)
+
+def mbox_event_cb(obj, evt):
+    if evt == lv.EVENT.DELETE:
+        info.set_text(welcome_info)
+
+def btn_event_cb(btn, evt):
+    if evt == lv.EVENT.CLICKED:
+
+        btns2 = ["Ok", "Cancel", ""]
+
+        # Create the message box as a child of the modal background
+        mbox = Modal(lv.scr_act())
+        mbox.add_btns(btns2)
+        mbox.set_text("Hello world!")
+        mbox.set_event_cb(mbox_event_cb)
+
+        info.set_text(in_msg_info)
+        info.align(None, lv.ALIGN.IN_BOTTOM_LEFT, 5, -5)
+
+# Get active screen
+scr = lv.scr_act()
+
+# Create a button, then set its position and event callback
+btn = lv.btn(scr)
+btn.set_size(200, 60)
+btn.set_event_cb(btn_event_cb)
+btn.align(None, lv.ALIGN.IN_TOP_LEFT, 20, 20)
+
+# Create a label on the button
+label = lv.label(btn)
+label.set_text("Display a message box!")
+
+# Create an informative label on the screen
+info = lv.label(scr)
+info.set_text(welcome_info)
+info.set_long_mode(lv.label.LONG.BREAK) # Make sure text will wrap
+info.set_width(scr.get_width() - 10)
+info.align(None, lv.ALIGN.IN_BOTTOM_LEFT, 5, -5)