Added Container.on_tap_down event for backward compatibilty with old on_click behavior (#2980)

Author: FeodorFitsner

packages/flet/lib/src/controls/container.dart

@@ -64,6 +64,7 @@ class ContainerControl extends StatelessWidget with FletStoreMixin {
         children.where((c) => c.name == "content" && c.isVisible);
     bool ink = control.attrBool("ink", false)!;
     bool onClick = control.attrBool("onclick", false)!;
+    bool onTapDown = control.attrBool("onTapDown", false)!;
     String url = control.attrString("url", "")!;
     String? urlTarget = control.attrString("urlTarget");
     bool onLongPress = control.attrBool("onLongPress", false)!;
@@ -160,12 +161,23 @@ class ContainerControl extends StatelessWidget with FletStoreMixin {
                         openWebBrowser(url, webWindowName: urlTarget);
                       }
                       if (onClick) {
-                        backend.triggerControlEvent(
-                            control.id,
-                            "click");
+                        backend.triggerControlEvent(control.id, "click");
                       }
                     }
                   : null,
+              onTapDown: onTapDown
+                  ? (details) {
+                      backend.triggerControlEvent(
+                          control.id,
+                          "tap_down",
+                          json.encode(ContainerTapEvent(
+                                  localX: details.localPosition.dx,
+                                  localY: details.localPosition.dy,
+                                  globalX: details.globalPosition.dx,
+                                  globalY: details.globalPosition.dy)
+                              .toJson()));
+                    }
+                  : null,
               onLongPress: onLongPress
                   ? () {
                       debugPrint("Container ${control.id} long pressed!");
@@ -241,8 +253,7 @@ class ContainerControl extends StatelessWidget with FletStoreMixin {
                     : null,
                 child: child);
 
-        if ((onClick || onLongPress || onHover || url != "") &&
-            !disabled) {
+        if ((onClick || onLongPress || onHover || url != "") && !disabled) {
           result = MouseRegion(
             cursor: onClick || url != ""
                 ? SystemMouseCursors.click
@@ -269,12 +280,23 @@ class ContainerControl extends StatelessWidget with FletStoreMixin {
                         openWebBrowser(url, webWindowName: urlTarget);
                       }
                       if (onClick) {
-                        backend.triggerControlEvent(
-                            control.id,
-                            "click");
+                        backend.triggerControlEvent(control.id, "click");
                       }
                     }
                   : null,
+              onTapDown: onTapDown
+                  ? (details) {
+                      backend.triggerControlEvent(
+                          control.id,
+                          "tap_down",
+                          json.encode(ContainerTapEvent(
+                                  localX: details.localPosition.dx,
+                                  localY: details.localPosition.dy,
+                                  globalX: details.globalPosition.dx,
+                                  globalY: details.globalPosition.dy)
+                              .toJson()));
+                    }
+                  : null,
               onLongPress: onLongPress
                   ? () {
                       debugPrint("Container ${control.id} clicked!");

sdk/python/packages/flet-core/src/flet_core/container.py

@@ -89,6 +89,7 @@ def __init__(
         theme: Optional[Theme] = None,
         theme_mode: Optional[ThemeMode] = None,
         on_click=None,
+        on_tap_down=None,
         on_long_press=None,
         on_hover=None,
         #
@@ -162,8 +163,8 @@ def convert_container_tap_event_data(e):
             d = json.loads(e.data)
             return ContainerTapEvent(**d)
 
-        self.__on_click = EventHandler(convert_container_tap_event_data)
-        self._add_event_handler("click", self.__on_click.get_handler())
+        self.__on_tap_down = EventHandler(convert_container_tap_event_data)
+        self._add_event_handler("tap_down", self.__on_tap_down.get_handler())
 
         self.content = content
         self.padding = padding
@@ -191,6 +192,7 @@ def convert_container_tap_event_data(e):
         self.theme = theme
         self.theme_mode = theme_mode
         self.on_click = on_click
+        self.on_tap_down = on_tap_down
         self.on_long_press = on_long_press
         self.on_hover = on_hover
 
@@ -481,6 +483,16 @@ def on_click(self, handler):
         self._add_event_handler("click", handler)
         self._set_attr("onClick", True if handler is not None else None)
 
+    # on_tap_down
+    @property
+    def on_tap_down(self):
+        return self.__on_tap_down
+
+    @on_tap_down.setter
+    def on_tap_down(self, handler):
+        self.__on_tap_down.subscribe(handler)
+        self._set_attr("onTapDown", True if handler is not None else None)
+
     # on_long_press
     @property
     def on_long_press(self):