Add is_target to Click event

demo/dialog.py

@@ -1,5 +1,7 @@
 """Simple dialog that looks similar to Angular Component Dialog."""
 
+from typing import Callable
+
 import mesop as me
 
 
@@ -17,7 +19,10 @@ class State:
 def app():
   state = me.state(State)
 
-  with dialog(state.is_open):
+  with dialog(
+    is_open=state.is_open,
+    on_click_background=on_click_close_background,
+  ):
     me.text("Delete File", type="headline-5")
     with me.box():
       me.text(text="Would you like to delete cat.jpeg?")
@@ -31,6 +36,12 @@ def app():
     )
 
 
+def on_click_close_background(e: me.ClickEvent):
+  state = me.state(State)
+  if e.is_target:
+    state.is_open = False
+
+
 def on_click_close_dialog(e: me.ClickEvent):
   state = me.state(State)
   state.is_open = False
@@ -42,18 +53,15 @@ def on_click_dialog_open(e: me.ClickEvent):
 
 
 @me.content_component
-def dialog(is_open: bool):
+def dialog(*, is_open: bool, on_click_background: Callable | None = None):
   """Renders a dialog component.
 
   The design of the dialog borrows from the Angular component dialog. So basically
   rounded corners and some box shadow.
 
-  One current drawback is that it's not possible to close the dialog
-  by clicking on the overlay background. This is due to
-  https://github.com/google/mesop/issues/268.
-
   Args:
     is_open: Whether the dialog is visible or not.
+    on_click_background: Event handler for when background is clicked
   """
   with me.box(
     style=me.Style(
@@ -67,14 +75,15 @@ def dialog(is_open: bool):
       position="fixed",
       width="100%",
       z_index=1000,
-    )
+    ),
   ):
     with me.box(
+      on_click=on_click_background,
       style=me.Style(
         place_items="center",
         display="grid",
         height="100vh",
-      )
+      ),
     ):
       with me.box(
         style=me.Style(

mesop/component_helpers/helper.py

@@ -470,9 +470,11 @@ def register_event_mapper(
   ClickEvent,
   lambda userEvent, key: ClickEvent(
     key=key.key,
+    is_target=userEvent.click.is_target,
   ),
 )
 
+
 runtime().register_event_mapper(
   InputEvent,
   lambda userEvent, key: InputEvent(

mesop/components/button/button.ts

@@ -1,6 +1,7 @@
 import {MatButtonModule} from '@angular/material/button';
 import {Component, Input} from '@angular/core';
 import {
+  ClickEvent,
   UserEvent,
   Key,
   Type,
@@ -37,6 +38,9 @@ export class ButtonComponent {
     const userEvent = new UserEvent();
     userEvent.setHandlerId(this.config().getOnClickHandlerId()!);
     userEvent.setKey(this.key);
+    const click = new ClickEvent();
+    click.setIsTarget(event.target === event.currentTarget);
+    userEvent.setClick(click);
     this.channel.dispatch(userEvent);
   }
 

mesop/events/events.py

@@ -13,9 +13,10 @@ class ClickEvent(MesopEvent):
 
   Attributes:
       key (str): key of the component that emitted this event.
+      is_target (bool): Whether the clicked target contains the event handler.
   """
 
-  pass
+  is_target: bool
 
 
 @dataclass(kw_only=True)

mesop/examples/testing/__init__.py

@@ -1,3 +1,6 @@
+from mesop.examples.testing import (
+  click_is_target as click_is_target,
+)
 from mesop.examples.testing import (
   complex_layout as complex_layout,
 )

mesop/examples/testing/click_is_target.py

@@ -0,0 +1,25 @@
+import mesop as me
+
+
+@me.stateclass
+class State:
+  box_clicked: bool
+  button_clicked: bool
+
+
+@me.page(path="/testing/click_is_target")
+def page():
+  state = me.state(State)
+  with me.box(on_click=on_click_box, style=me.Style(background="red")):
+    me.button("Click", on_click=on_click_button, type="flat")
+  me.text(f"Box clicked: {state.box_clicked}")
+  me.text(f"Button clicked: {state.button_clicked}")
+
+
+def on_click_box(e: me.ClickEvent):
+  if e.is_target:
+    me.state(State).box_clicked = True
+
+
+def on_click_button(e: me.ClickEvent):
+  me.state(State).button_clicked = True

mesop/protos/ui.proto

@@ -24,7 +24,7 @@ message QueryParam {
     repeated string values = 2;
 }
 
-// Next ID: 16
+// Next ID: 17
 message UserEvent {
     optional States states = 1;
 
@@ -46,6 +46,7 @@ message UserEvent {
         ResizeEvent resize = 10;
         bytes bytes_value = 9;
         ChangePrefersColorScheme change_prefers_color_scheme = 14;
+        ClickEvent click = 16;
     }
 
     optional string state_token = 12;
@@ -78,6 +79,11 @@ message ArgPathSegment {
     }
 }
 
+// Click event parameters
+message ClickEvent {
+    optional bool is_target = 1;
+}
+
 // This is a user-triggered navigation (e.g. go back/forwards) or a hot reload event.
 message NavigationEvent{
 }

mesop/tests/e2e/click_is_target_test.ts

@@ -0,0 +1,19 @@
+import {test, expect} from '@playwright/test';
+
+test('is_target', async ({page}) => {
+  await page.goto('/testing/click_is_target');
+  await expect(page.getByText('Box clicked: False')).toBeVisible();
+  await expect(page.getByText('Button clicked: False')).toBeVisible();
+
+  await page.getByRole('button', {name: 'Click'}).click();
+  await expect(page.getByText('Box clicked: False')).toBeVisible();
+  await expect(page.getByText('Button clicked: True')).toBeVisible();
+
+  (
+    await page.locator(
+      '//component-renderer[contains(@style, "background: red")]',
+    )
+  ).click();
+  await expect(page.getByText('Box clicked: True')).toBeVisible();
+  await expect(page.getByText('Button clicked: True')).toBeVisible();
+});

mesop/web/src/component_renderer/component_renderer.ts

@@ -11,6 +11,7 @@ import {
 } from '@angular/core';
 import {CommonModule} from '@angular/common';
 import {
+  ClickEvent,
   Component as ComponentProto,
   UserEvent,
   WebComponentType,
@@ -414,6 +415,9 @@ Make sure the web component name is spelled the same between Python and JavaScri
     const userEvent = new UserEvent();
     userEvent.setHandlerId(this._boxType.getOnClickHandlerId()!);
     userEvent.setKey(this.component.getKey());
+    const click = new ClickEvent();
+    click.setIsTarget(event.target === event.currentTarget);
+    userEvent.setClick(click);
     this.channel.dispatch(userEvent);
   }