1 files changed, 132 insertions, 0 deletions
diff --git a/widget/windows/TaskbarPreview.h b/widget/windows/TaskbarPreview.h
new file mode 100644
index 0000000000..ca21e3eeb8
--- /dev/null
+++ b/widget/windows/TaskbarPreview.h
@@ -0,0 +1,132 @@
+/* vim: se cin sw=2 ts=2 et : */
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef __mozilla_widget_TaskbarPreview_h__
+#define __mozilla_widget_TaskbarPreview_h__
+
+#include <windows.h>
+#include <shobjidl.h>
+#undef LogSeverity  // SetupAPI.h #defines this as DWORD
+
+#include "mozilla/RefPtr.h"
+#include <nsITaskbarPreview.h>
+#include <nsITaskbarPreviewController.h>
+#include <nsString.h>
+#include <nsIWeakReferenceUtils.h>
+#include <nsIDocShell.h>
+#include "WindowHook.h"
+
+namespace mozilla {
+namespace widget {
+
+class TaskbarPreviewCallback;
+
+class TaskbarPreview : public nsITaskbarPreview {
+ public:
+  TaskbarPreview(ITaskbarList4* aTaskbar,
+                 nsITaskbarPreviewController* aController, HWND aHWND,
+                 nsIDocShell* aShell);
+  virtual nsresult Init();
+
+  friend class TaskbarPreviewCallback;
+
+  NS_DECL_NSITASKBARPREVIEW
+
+ protected:
+  virtual ~TaskbarPreview();
+
+  // Called to update ITaskbarList4 dependent properties
+  virtual nsresult UpdateTaskbarProperties();
+
+  // Invoked when the preview is made visible
+  virtual nsresult Enable();
+  // Invoked when the preview is made invisible
+  virtual nsresult Disable();
+
+  // Detaches this preview from the nsWindow instance it's tied to
+  virtual void DetachFromNSWindow();
+
+  // Determines if the window is available and a destroy has not yet started
+  bool IsWindowAvailable() const;
+
+  // Marks this preview as being active
+  virtual nsresult ShowActive(bool active) = 0;
+  // Gets a reference to the window used to handle the preview messages
+  virtual HWND& PreviewWindow() = 0;
+
+  // Window procedure for the PreviewWindow (hooked for window previews)
+  virtual LRESULT WndProc(UINT nMsg, WPARAM wParam, LPARAM lParam);
+
+  // Returns whether or not the taskbar icon has been created for mWnd The
+  // ITaskbarList4 API requires that we wait until the icon has been created
+  // before we can call its methods.
+  bool CanMakeTaskbarCalls();
+
+  // Gets the WindowHook for the nsWindow
+  WindowHook* GetWindowHook();
+
+  // Enables/disables custom drawing for the given window
+  static void EnableCustomDrawing(HWND aHWND, bool aEnable);
+
+  // MSCOM Taskbar interface
+  RefPtr<ITaskbarList4> mTaskbar;
+  // Controller for this preview
+  nsCOMPtr<nsITaskbarPreviewController> mController;
+  // The HWND to the nsWindow that this object previews
+  HWND mWnd;
+  // Whether or not this preview is visible
+  bool mVisible;
+
+ private:
+  // Called when the tooltip should be updated
+  nsresult UpdateTooltip();
+
+  // Requests the controller to draw into a canvas of the given width and
+  // height. The resulting bitmap is sent to the DWM to display.
+  void DrawBitmap(uint32_t width, uint32_t height, bool isPreview);
+
+  // WindowHook procedure for hooking mWnd
+  static bool MainWindowHook(void* aContext, HWND hWnd, UINT nMsg,
+                             WPARAM wParam, LPARAM lParam, LRESULT* aResult);
+
+  // Docshell corresponding to the <window> the nsWindow contains
+  nsWeakPtr mDocShell;
+  nsString mTooltip;
+
+  // The preview currently marked as active in the taskbar. nullptr if no
+  // preview is active (some other window is).
+  static TaskbarPreview* sActivePreview;
+};
+
+/*
+ * Callback object TaskbarPreview hands to preview controllers when we
+ * request async thumbnail or live preview images. Controllers invoke
+ * this interface once they have aquired the requested image.
+ */
+class TaskbarPreviewCallback : public nsITaskbarPreviewCallback {
+ public:
+  TaskbarPreviewCallback() : mIsThumbnail(true) {}
+
+  NS_DECL_ISUPPORTS
+  NS_DECL_NSITASKBARPREVIEWCALLBACK
+
+  void SetPreview(TaskbarPreview* aPreview) { mPreview = aPreview; }
+
+  void SetIsPreview() { mIsThumbnail = false; }
+
+ protected:
+  virtual ~TaskbarPreviewCallback() {}
+
+ private:
+  RefPtr<TaskbarPreview> mPreview;
+  bool mIsThumbnail;
+};
+
+}  // namespace widget
+}  // namespace mozilla
+
+#endif /* __mozilla_widget_TaskbarPreview_h__ */