feat: allow resizing undecorated window using touch

closes #399
closes #398

.changes/resizing-undecorated-window-touch.md

@@ -0,0 +1,6 @@
+---
+"wry": patch
+---
+
+* Fix hovering over an edge of undecorated window on Linux won't change cursor.
+* Undecorated window can be resized using touch on Linux and Windows.

src/webview/webkitgtk/mod.rs

@@ -4,7 +4,7 @@
 
 use std::rc::Rc;
 
-use gdk::{WindowEdge, RGBA};
+use gdk::{Cursor, EventMask, WindowEdge, RGBA};
 use gio::Cancellable;
 use glib::signal::Inhibit;
 use gtk::prelude::*;
@@ -108,6 +108,47 @@ impl InnerWebView {
       close_window.gtk_window().close();
     });
 
+    webview.add_events(
+      EventMask::POINTER_MOTION_MASK
+        | EventMask::BUTTON1_MOTION_MASK
+        | EventMask::BUTTON_PRESS_MASK
+        | EventMask::TOUCH_MASK,
+    );
+    webview.connect_motion_notify_event(|webview, event| {
+      // This one should be GtkWindow
+      if let Some(widget) = webview.parent() {
+        // This one should be GtkWindow
+        if let Some(window) = widget.parent() {
+          // Safe to unwrap unless this is not from tao
+          let window: gtk::Window = window.downcast().unwrap();
+          if !window.is_decorated() && window.is_resizable() {
+            if let Some(window) = window.window() {
+              let (cx, cy) = event.root();
+              let edge = hit_test(&window, cx, cy);
+              // FIXME: calling `window.begin_resize_drag` seems to revert the cursor back to normal style
+              window.set_cursor(
+                Cursor::from_name(
+                  &window.display(),
+                  match edge {
+                    WindowEdge::North => "n-resize",
+                    WindowEdge::South => "s-resize",
+                    WindowEdge::East => "e-resize",
+                    WindowEdge::West => "w-resize",
+                    WindowEdge::NorthWest => "nw-resize",
+                    WindowEdge::NorthEast => "ne-resize",
+                    WindowEdge::SouthEast => "se-resize",
+                    WindowEdge::SouthWest => "sw-resize",
+                    _ => "default",
+                  },
+                )
+                .as_ref(),
+              );
+            }
+          }
+        }
+      }
+      Inhibit(false)
+    });
     webview.connect_button_press_event(|webview, event| {
       if event.button() == 1 {
         let (cx, cy) = event.root();
@@ -118,13 +159,48 @@ impl InnerWebView {
             // Safe to unwrap unless this is not from tao
             let window: gtk::Window = window.downcast().unwrap();
             if !window.is_decorated() && window.is_resizable() {
-              // Safe to unwrap since it's a valide GtkWindow
-              let result = hit_test(&window.window().unwrap(), cx, cy);
-
-              // we ignore the `__Unknown` variant so the webview receives the click correctly if it is not on the edges.
-              match result {
-                WindowEdge::__Unknown(_) => (),
-                _ => window.begin_resize_drag(result, 1, cx as i32, cy as i32, event.time()),
+              if let Some(window) = window.window() {
+                // Safe to unwrap since it's a valide GtkWindow
+                let result = hit_test(&window, cx, cy);
+
+                // we ignore the `__Unknown` variant so the webview receives the click correctly if it is not on the edges.
+                match result {
+                  WindowEdge::__Unknown(_) => (),
+                  _ => window.begin_resize_drag(result, 1, cx as i32, cy as i32, event.time()),
+                }
+              }
+            }
+          }
+        }
+      }
+      Inhibit(false)
+    });
+    webview.connect_touch_event(|webview, event| {
+      // This one should be GtkBox
+      if let Some(widget) = webview.parent() {
+        // This one should be GtkWindow
+        if let Some(window) = widget.parent() {
+          // Safe to unwrap unless this is not from tao
+          let window: gtk::Window = window.downcast().unwrap();
+          if !window.is_decorated() && window.is_resizable() {
+            if let Some(window) = window.window() {
+              if let Some((cx, cy)) = event.root_coords() {
+                if let Some(device) = event.device() {
+                  let result = hit_test(&window, cx, cy);
+
+                  // we ignore the `__Unknown` variant so the window receives the click correctly if it is not on the edges.
+                  match result {
+                    WindowEdge::__Unknown(_) => (),
+                    _ => window.begin_resize_drag_for_device(
+                      result,
+                      &device,
+                      0,
+                      cx as i32,
+                      cy as i32,
+                      event.time(),
+                    ),
+                  }
+                }
               }
             }
           }

src/webview/webview2/mod.rs

@@ -112,7 +112,8 @@ impl InnerWebView {
             window.addEventListener('mousedown', (e) => {
               if (e.buttons === 1) window.chrome.webview.postMessage('__WEBVIEW_LEFT_MOUSE_DOWN__')
             });
-            window.addEventListener('mousemove', () => window.chrome.webview.postMessage('__WEBVIEW_MOUSE_MOVE__'));
+            window.addEventListener('touchstart', (e) => window.chrome.webview.postMessage('__WEBVIEW_TOUCH_START__'));
+            window.addEventListener('mousemove', (e) => window.chrome.webview.postMessage('__WEBVIEW_MOUSE_MOVE__'));
           "#,
           |_| (Ok(())),
         )?;
@@ -126,7 +127,7 @@ impl InnerWebView {
         let rpc_handler = attributes.rpc_handler.take();
         w.add_web_message_received(move |webview, args| {
           let js = args.try_get_web_message_as_string()?;
-          if js == "__WEBVIEW_LEFT_MOUSE_DOWN__" || js == "__WEBVIEW_MOUSE_MOVE__" {
+          if js == "__WEBVIEW_LEFT_MOUSE_DOWN__" || js == "__WEBVIEW_TOUCH_START__" || js == "__WEBVIEW_MOUSE_MOVE__" {
             if !window_.is_decorated() && window_.is_resizable() {
               use winapi::um::winuser::{
                 HTBOTTOM, HTBOTTOMLEFT, HTBOTTOMRIGHT, HTLEFT, HTRIGHT,
@@ -158,7 +159,7 @@ impl InnerWebView {
                 window_.set_cursor_icon(cursor);
               }
 
-              if js == "__WEBVIEW_LEFT_MOUSE_DOWN__"  {
+              if js == "__WEBVIEW_LEFT_MOUSE_DOWN__" || js == "__WEBVIEW_TOUCH_START__" {
                 // we ignore `HTCLIENT` variant so the webview receives the click correctly if it is not on the edges
                 // and prevent conflict with `tao::window::drag_window`.
                 if result != HTCLIENT {