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/*
* Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010 Apple Inc. All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef THIRD_PARTY_BLINK_RENDERER_CORE_EDITING_SELECTION_MODIFIER_H_
#define THIRD_PARTY_BLINK_RENDERER_CORE_EDITING_SELECTION_MODIFIER_H_
#include "base/macros.h"
#include "third_party/blink/renderer/core/core_export.h"
#include "third_party/blink/renderer/core/editing/selection_template.h"
#include "third_party/blink/renderer/core/editing/visible_selection.h"
#include "third_party/blink/renderer/platform/geometry/layout_unit.h"
#include "third_party/blink/renderer/platform/wtf/allocator/allocator.h"
namespace blink {
class LocalFrame;
enum class SelectionModifyAlteration { kMove, kExtend };
enum class SelectionModifyVerticalDirection { kUp, kDown };
enum class SelectionModifyDirection { kBackward, kForward, kLeft, kRight };
class CORE_EXPORT SelectionModifier {
STACK_ALLOCATED();
public:
// |frame| is used for providing settings.
SelectionModifier(const LocalFrame& /* frame */,
const SelectionInDOMTree&,
LayoutUnit);
SelectionModifier(const LocalFrame&, const SelectionInDOMTree&);
LayoutUnit XPosForVerticalArrowNavigation() const {
return x_pos_for_vertical_arrow_navigation_;
}
// TODO(editing-dev): We should rename |Selection()| to
// |ComputeVisibleSelectionDeprecated()| and introduce |GetSelection()|
// to return |current_selection_|.
VisibleSelection Selection() const;
bool Modify(SelectionModifyAlteration,
SelectionModifyDirection,
TextGranularity);
bool ModifyWithPageGranularity(SelectionModifyAlteration,
unsigned vertical_distance,
SelectionModifyVerticalDirection);
void SetSelectionIsDirectional(bool selection_is_directional) {
selection_is_directional_ = selection_is_directional;
}
private:
const LocalFrame& GetFrame() const { return *frame_; }
static bool ShouldAlwaysUseDirectionalSelection(const LocalFrame&);
VisibleSelection PrepareToModifySelection(SelectionModifyAlteration,
SelectionModifyDirection) const;
TextDirection DirectionOfEnclosingBlock() const;
TextDirection DirectionOfSelection() const;
TextDirection LineDirectionOfExtent() const;
VisiblePosition PositionForPlatform(bool is_get_start) const;
VisiblePosition StartForPlatform() const;
VisiblePosition EndForPlatform() const;
LayoutUnit LineDirectionPointForBlockDirectionNavigation(const Position&);
VisiblePosition ComputeModifyPosition(SelectionModifyAlteration,
SelectionModifyDirection,
TextGranularity);
VisiblePosition ModifyExtendingRight(TextGranularity);
VisiblePosition ModifyExtendingRightInternal(TextGranularity);
VisiblePosition ModifyExtendingForward(TextGranularity);
VisiblePosition ModifyExtendingForwardInternal(TextGranularity);
VisiblePosition ModifyMovingRight(TextGranularity);
VisiblePosition ModifyMovingForward(TextGranularity);
VisiblePosition ModifyExtendingLeft(TextGranularity);
VisiblePosition ModifyExtendingLeftInternal(TextGranularity);
VisiblePosition ModifyExtendingBackward(TextGranularity);
VisiblePosition ModifyExtendingBackwardInternal(TextGranularity);
VisiblePosition ModifyMovingLeft(TextGranularity);
VisiblePosition ModifyMovingBackward(TextGranularity);
Position NextWordPositionForPlatform(const Position&);
static VisiblePosition PreviousLinePosition(const VisiblePosition&,
LayoutUnit line_direction_point);
static VisiblePosition NextLinePosition(const VisiblePosition&,
LayoutUnit line_direction_point);
static VisiblePosition PreviousParagraphPosition(
const VisiblePosition&,
LayoutUnit line_direction_point);
static VisiblePosition NextParagraphPosition(const VisiblePosition&,
LayoutUnit line_direction_point);
Member<const LocalFrame> frame_;
// TODO(editing-dev): We should get rid of |selection_| once we change
// all member functions not to use |selection_|.
// |selection_| is used as implicit parameter or a cache instead of pass it.
VisibleSelection selection_;
// TODO(editing-dev): We should introduce |GetSelection()| to return
// |result_| to replace |Selection().AsSelection()|.
// |current_selection_| holds initial value and result of |Modify()|.
SelectionInDOMTree current_selection_;
LayoutUnit x_pos_for_vertical_arrow_navigation_;
bool selection_is_directional_ = false;
DISALLOW_COPY_AND_ASSIGN(SelectionModifier);
};
LayoutUnit NoXPosForVerticalArrowNavigation();
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_CORE_EDITING_SELECTION_MODIFIER_H_
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