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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef UI_BASE_GESTURES_GESTURE_TYPES_H_
#define UI_BASE_GESTURES_GESTURE_TYPES_H_
#include "base/logging.h"
#include "ui/events/event_constants.h"
#include "ui/gfx/rect.h"
namespace ui {
class GestureEvent;
class TouchEvent;
struct UI_EXPORT GestureEventDetails {
public:
GestureEventDetails(EventType type, float delta_x, float delta_y);
GestureEventDetails(EventType type,
float delta_x, float delta_y,
float delta_x_ordinal, float delta_y_ordinal);
EventType type() const { return type_; }
int touch_points() const { return touch_points_; }
void set_touch_points(int touch_points) { touch_points_ = touch_points; }
const gfx::Rect& bounding_box() const { return bounding_box_; }
void set_bounding_box(const gfx::Rect& box) { bounding_box_ = box; }
void SetScrollVelocity(float velocity_x, float velocity_y,
float velocity_x_ordinal, float velocity_y_ordinal);
float scroll_x() const {
CHECK_EQ(ui::ET_GESTURE_SCROLL_UPDATE, type_);
return data.scroll_update.x;
}
float scroll_y() const {
CHECK_EQ(ui::ET_GESTURE_SCROLL_UPDATE, type_);
return data.scroll_update.y;
}
float velocity_x() const {
CHECK(type_ == ui::ET_GESTURE_SCROLL_UPDATE ||
type_ == ui::ET_SCROLL_FLING_START);
return type_ == ui::ET_SCROLL_FLING_START ? data.fling_velocity.x :
data.scroll_update.velocity_x;
}
float velocity_y() const {
CHECK(type_ == ui::ET_GESTURE_SCROLL_UPDATE ||
type_ == ui::ET_SCROLL_FLING_START);
return type_ == ui::ET_SCROLL_FLING_START ? data.fling_velocity.y :
data.scroll_update.velocity_y;
}
// *_ordinal values are unmodified by rail based clamping.
float scroll_x_ordinal() const {
CHECK_EQ(ui::ET_GESTURE_SCROLL_UPDATE, type_);
return data.scroll_update.x_ordinal;
}
float scroll_y_ordinal() const {
CHECK_EQ(ui::ET_GESTURE_SCROLL_UPDATE, type_);
return data.scroll_update.y_ordinal;
}
float velocity_x_ordinal() const {
CHECK(type_ == ui::ET_GESTURE_SCROLL_UPDATE ||
type_ == ui::ET_SCROLL_FLING_START);
return type_ == ui::ET_SCROLL_FLING_START ?
data.fling_velocity.x_ordinal :
data.scroll_update.velocity_x_ordinal;
}
float velocity_y_ordinal() const {
CHECK(type_ == ui::ET_GESTURE_SCROLL_UPDATE ||
type_ == ui::ET_SCROLL_FLING_START);
return type_ == ui::ET_SCROLL_FLING_START ?
data.fling_velocity.y_ordinal :
data.scroll_update.velocity_y_ordinal;
}
int touch_id() const {
CHECK_EQ(ui::ET_GESTURE_LONG_PRESS, type_);
return data.touch_id;
}
float first_finger_width() const {
CHECK_EQ(ui::ET_GESTURE_TWO_FINGER_TAP, type_);
return data.first_finger_enclosing_rectangle.width;
}
float first_finger_height() const {
CHECK_EQ(ui::ET_GESTURE_TWO_FINGER_TAP, type_);
return data.first_finger_enclosing_rectangle.height;
}
float scale() const {
CHECK_EQ(ui::ET_GESTURE_PINCH_UPDATE, type_);
return data.scale;
}
bool swipe_left() const {
CHECK_EQ(ui::ET_GESTURE_MULTIFINGER_SWIPE, type_);
return data.swipe.left;
}
bool swipe_right() const {
CHECK_EQ(ui::ET_GESTURE_MULTIFINGER_SWIPE, type_);
return data.swipe.right;
}
bool swipe_up() const {
CHECK_EQ(ui::ET_GESTURE_MULTIFINGER_SWIPE, type_);
return data.swipe.up;
}
bool swipe_down() const {
CHECK_EQ(ui::ET_GESTURE_MULTIFINGER_SWIPE, type_);
return data.swipe.down;
}
int tap_count() const {
CHECK_EQ(ui::ET_GESTURE_TAP, type_);
return data.tap_count;
}
private:
ui::EventType type_;
union {
struct { // SCROLL delta.
float x;
float y;
float velocity_x;
float velocity_y;
float x_ordinal;
float y_ordinal;
float velocity_x_ordinal;
float velocity_y_ordinal;
} scroll_update;
float scale; // PINCH scale.
struct { // FLING velocity.
float x;
float y;
float x_ordinal;
float y_ordinal;
} fling_velocity;
int touch_id; // LONG_PRESS touch-id.
// Dimensions of the first finger's enclosing rectangle for TWO_FINGER_TAP.
struct {
float width;
float height;
} first_finger_enclosing_rectangle;
struct { // SWIPE direction.
bool left;
bool right;
bool up;
bool down;
} swipe;
int tap_count; // TAP repeat count.
} data;
int touch_points_; // Number of active touch points in the gesture.
// Bounding box is an axis-aligned rectangle that contains all the
// enclosing rectangles of the touch-points in the gesture.
gfx::Rect bounding_box_;
};
// An abstract type for consumers of gesture-events created by the
// gesture-recognizer.
class UI_EXPORT GestureConsumer {
public:
GestureConsumer()
: ignores_events_(false) {
}
explicit GestureConsumer(bool ignores_events)
: ignores_events_(ignores_events) {
}
virtual ~GestureConsumer() {}
// TODO: this is a hack! GestureRecognizer should never expose the internal
// marker object that implements this.
bool ignores_events() { return ignores_events_; }
private:
const bool ignores_events_;
};
// GestureEventHelper creates implementation-specific gesture events and
// can dispatch them.
class UI_EXPORT GestureEventHelper {
public:
virtual ~GestureEventHelper() {
}
virtual bool DispatchLongPressGestureEvent(GestureEvent* event) = 0;
virtual bool DispatchCancelTouchEvent(TouchEvent* event) = 0;
};
} // namespace ui
#endif // UI_BASE_GESTURES_GESTURE_TYPES_H_
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