Source/core/platform/mac/ScrollElasticityController.h - Issue 99103006: Moving GraphicsContext and dependencies from core to platform.

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Issue 99103006: Moving GraphicsContext and dependencies from core to platform. (Closed) Base URL: svn://svn.chromium.org/blink/trunk

Patch Set: Final patch - fixes Android Created 7 years ago

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1 /*

2 * Copyright (C) 2011 Apple Inc. All rights reserved.

3 *

4 * Redistribution and use in source and binary forms, with or without

5 * modification, are permitted provided that the following conditions

6 * are met:

7 * 1. Redistributions of source code must retain the above copyright

8 * notice, this list of conditions and the following disclaimer.

9 * 2. Redistributions in binary form must reproduce the above copyright

10 * notice, this list of conditions and the following disclaimer in the

11 * documentation and/or other materials provided with the distribution.

12 *

13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''

14 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,

15 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR

16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS

17 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR

18 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF

19 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS

20 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN

21 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)

22 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF

23 * THE POSSIBILITY OF SUCH DAMAGE.

24 */

25

26 #ifndef ScrollElasticityController_h

27 #define ScrollElasticityController_h

28

29 #if USE(RUBBER_BANDING)

30

31 #include "platform/geometry/FloatPoint.h"

32 #include "platform/geometry/FloatSize.h"

33 #include "platform/scroll/ScrollTypes.h"

34 #include "wtf/Noncopyable.h"

35

36 namespace WebCore {

37

38 class PlatformWheelEvent;

39

40 class ScrollElasticityControllerClient {

41 protected:

42 virtual ~ScrollElasticityControllerClient() { }

43

44 public:

45 virtual bool allowsHorizontalStretching() = 0;

46 virtual bool allowsVerticalStretching() = 0;

47 virtual IntSize stretchAmount() = 0;

48 virtual bool pinnedInDirection(const FloatSize&) = 0;

49 virtual bool canScrollHorizontally() = 0;

50 virtual bool canScrollVertically() = 0;

51 virtual bool shouldRubberBandInDirection(ScrollDirection) = 0;

52

53 // Return the absolute scroll position, not relative to the scroll origin.

54 virtual WebCore::IntPoint absoluteScrollPosition() = 0;

55

56 virtual void immediateScrollBy(const FloatSize&) = 0;

57 virtual void immediateScrollByWithoutContentEdgeConstraints(const FloatSize& ) = 0;

58 virtual void startSnapRubberbandTimer() = 0;

59 virtual void stopSnapRubberbandTimer() = 0;

60 };

61

62 class ScrollElasticityController {

63 WTF_MAKE_NONCOPYABLE(ScrollElasticityController);

64

65 public:

66 explicit ScrollElasticityController(ScrollElasticityControllerClient*);

67

68 bool handleWheelEvent(const PlatformWheelEvent&);

69 void snapRubberBandTimerFired();

70

71 bool isRubberBandInProgress() const;

72

73 private:

74 void stopSnapRubberbandTimer();

75 void snapRubberBand();

76

77 bool shouldRubberBandInHorizontalDirection(const PlatformWheelEvent&);

78

79 ScrollElasticityControllerClient* m_client;

80

81 bool m_inScrollGesture;

82 bool m_momentumScrollInProgress;

83 bool m_ignoreMomentumScrolls;

84

85 CFTimeInterval m_lastMomentumScrollTimestamp;

86 FloatSize m_overflowScrollDelta;

87 FloatSize m_stretchScrollForce;

88 FloatSize m_momentumVelocity;

89

90 // Rubber band state.

91 CFTimeInterval m_startTime;

92 FloatSize m_startStretch;

93 FloatPoint m_origOrigin;

94 FloatSize m_origVelocity;

95

96 bool m_snapRubberbandTimerIsActive;

97 };

98

99 } // namespace WebCore

100

101 #endif // USE(RUBBER_BANDING)

102

103 #endif // ScrollElasticityController_h

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