Update panel layout immediately after the user has finished resizing a panel.

chrome/browser/ui/views/panels/x11_panel_resizer.cc

+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "chrome/browser/ui/views/panels/x11_panel_resizer.h"
+
+#include "chrome/browser/ui/panels/panel.h"
+#include "chrome/browser/ui/panels/panel_manager.h"
+#include "ui/aura/window.h"
+#include "ui/aura/window_delegate.h"
+#include "ui/base/hit_test.h"
+#include "ui/events/event.h"
+#include "ui/events/event_utils.h"
+#include "ui/views/view.h"
+
+namespace {
+
+// Returns true if the window can be resized via |component|.
+bool IsWindowBorder(int component) {
+  return component == HTBOTTOM ||
+      component == HTBOTTOMLEFT ||
+      component == HTBOTTOMRIGHT ||
+      component == HTLEFT ||
+      component == HTRIGHT ||
+      component == HTTOP ||
+      component == HTTOPLEFT ||
+      component == HTTOPRIGHT;
+}
+
+}  // namespace
+
+X11PanelResizer::X11PanelResizer(Panel* panel, aura::Window* window)
+    : panel_(panel),
+      window_(window),
+      resize_state_(NOT_RESIZING),
+      resize_component_(HTNOWHERE) {
+}
+
+X11PanelResizer::~X11PanelResizer() {
+  StopResizing(NULL, true);
+}
+
+void X11PanelResizer::OnMousePressed(ui::MouseEvent* event) {
+  if (resize_state_ != NOT_RESIZING ||
+      event->type() != ui::ET_MOUSE_PRESSED ||
+      !event->IsLeftMouseButton() ||
+      !event->native_event()) {
+    return;
+  }
+
+  int component = window_->delegate()->GetNonClientComponent(event->location());
+  if (!IsWindowBorder(component))
+    return;
+
+  // Set capture so that we get notified of all subsequent events.
+  window_->SetCapture();
+
+  resize_state_ = RESIZE_CAN_START;
+  initial_press_location_in_screen_ = ui::EventSystemLocationFromNative(
+      event->native_event());
+  resize_component_ = component;
+  event->StopPropagation();
+}
+
+void X11PanelResizer::OnMouseDragged(ui::MouseEvent* event) {
+  if (resize_state_ != RESIZE_CAN_START &&
+      resize_state_ != RESIZE_IN_PROGRESS) {
+    return;
+  }
+
+  if (!event->native_event())
+    return;
+
+  // Get the location in screen coordinates from the XEvent because converting
+  // the mouse location to screen coordinates using ScreenPositionClient returns
+  // an incorrect location while the panel is moving. See crbug.com/353393 for
+  // more details.
+  // TODO: Fix conversion to screen coordinates.
+  gfx::Point location_in_screen = ui::EventSystemLocationFromNative(
+      event->native_event());
+  if (resize_state_ == RESIZE_CAN_START) {
+    gfx::Vector2d delta =
+        location_in_screen - initial_press_location_in_screen_;
+    if (views::View::ExceededDragThreshold(delta)) {
+      resize_state_ = RESIZE_IN_PROGRESS;
+      panel_->manager()->StartResizingByMouse(panel_, location_in_screen,
+                                              resize_component_);
+    }
+  }
+
+  if (resize_state_ == RESIZE_IN_PROGRESS)
+    panel_->manager()->ResizeByMouse(location_in_screen);
+
+  event->StopPropagation();
+}
+
+void X11PanelResizer::StopResizing(ui::MouseEvent* event, bool canceled) {
+  if (resize_state_ == NOT_RESIZING)
+    return;
+
+  if (resize_state_ == RESIZE_IN_PROGRESS) {
+    panel_->manager()->EndResizingByMouse(canceled);
+    window_->ReleaseCapture();
+  }
+  if (event)
+    event->StopPropagation();
+  resize_state_ = NOT_RESIZING;
+}
+
+void X11PanelResizer::OnMouseEvent(ui::MouseEvent* event) {
+  switch (event->type()) {
+    case ui::ET_MOUSE_PRESSED:
+      OnMousePressed(event);
+      break;
+    case ui::ET_MOUSE_DRAGGED:
+      OnMouseDragged(event);
+      break;
+    case ui::ET_MOUSE_RELEASED:
+      StopResizing(event, false);
+      break;
+    case ui::ET_MOUSE_CAPTURE_CHANGED:
+      StopResizing(event, true);
+      break;
+    default:
+      break;
+  }
+}