gecko-dev/layout/xul/nsResizerFrame.h

/* -*- 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 {
    nsString 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___ */