1 files changed, 83 insertions, 0 deletions
diff --git a/layout/xul/nsResizerFrame.h b/layout/xul/nsResizerFrame.h
new file mode 100644
index 0000000000..52115746f7
--- /dev/null
+++ b/layout/xul/nsResizerFrame.h
@@ -0,0 +1,83 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* 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 nsResizerFrame_h___
+#define nsResizerFrame_h___
+
+#include "mozilla/Attributes.h"
+#include "mozilla/EventForwards.h"
+#include "nsTitleBarFrame.h"
+
+class nsIBaseWindow;
+
+namespace mozilla {
+class PresShell;
+}  // namespace mozilla
+
+class nsResizerFrame final : public nsTitleBarFrame {
+ protected:
+  typedef mozilla::LayoutDeviceIntPoint LayoutDeviceIntPoint;
+  typedef mozilla::LayoutDeviceIntRect LayoutDeviceIntRect;
+
+  struct Direction {
+    int8_t mHorizontal;
+    int8_t mVertical;
+  };
+
+ public:
+  NS_DECL_FRAMEARENA_HELPERS(nsResizerFrame)
+
+  friend nsIFrame* NS_NewResizerFrame(mozilla::PresShell* aPresShell,
+                                      ComputedStyle* aStyle);
+
+  explicit nsResizerFrame(ComputedStyle* aStyle, nsPresContext* aPresContext);
+
+  virtual nsresult HandleEvent(nsPresContext* aPresContext,
+                               mozilla::WidgetGUIEvent* aEvent,
+                               nsEventStatus* aEventStatus) override;
+
+  MOZ_CAN_RUN_SCRIPT_BOUNDARY
+  virtual void MouseClicked(mozilla::WidgetMouseEvent* aEvent) override;
+
+ protected:
+  nsIContent* GetContentToResize(mozilla::PresShell* aPresShell,
+                                 nsIBaseWindow** aWindow);
+
+  Direction GetDirection();
+
+  /**
+   * Adjust the window position and size in a direction according to the mouse
+   * movement and the resizer direction. The minimum and maximum size is used
+   * to constrain the size.
+   *
+   * @param aPos left or top position
+   * @param aSize width or height
+   * @param aMinSize minimum width or height
+   * @param aMacSize maximum width or height
+   * @param aMovement the amount the mouse was moved
+   * @param aResizerDirection resizer direction returned by GetDirection
+   */
+  static void AdjustDimensions(int32_t* aPos, int32_t* aSize, int32_t aMinSize,
+                               int32_t aMaxSize, int32_t aMovement,
+                               int8_t aResizerDirection);
+
+  struct SizeInfo {
+    nsCString width, height;
+  };
+  static void SizeInfoDtorFunc(void* aObject, nsAtom* aPropertyName,
+                               void* aPropertyValue, void* aData);
+  static void ResizeContent(nsIContent* aContent, const Direction& aDirection,
+                            const SizeInfo& aSizeInfo,
+                            SizeInfo* aOriginalSizeInfo);
+  static void MaybePersistOriginalSize(nsIContent* aContent,
+                                       const SizeInfo& aSizeInfo);
+  static void RestoreOriginalSize(nsIContent* aContent);
+
+ protected:
+  LayoutDeviceIntRect mMouseDownRect;
+  LayoutDeviceIntPoint mMouseDownPoint;
+};  // class nsResizerFrame
+
+#endif /* nsResizerFrame_h___ */