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// Copyright (c) 2010 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.
#include "pdf/button.h"
#include "base/logging.h"
#include "pdf/draw_utils.h"
#include "ppapi/cpp/input_event.h"
namespace chrome_pdf {
Button::Button()
: style_(BUTTON_CLICKABLE), state_(BUTTON_NORMAL), is_pressed_(false) {
}
Button::~Button() {
}
bool Button::CreateButton(uint32 id,
const pp::Point& origin,
bool visible,
Control::Owner* owner,
ButtonStyle style,
const pp::ImageData& face_normal,
const pp::ImageData& face_highlighted,
const pp::ImageData& face_pressed) {
DCHECK(face_normal.size().GetArea());
DCHECK(face_normal.size() == face_highlighted.size());
DCHECK(face_normal.size() == face_pressed.size());
pp::Rect rc(origin, face_normal.size());
if (!Control::Create(id, rc, visible, owner))
return false;
style_ = style;
normal_ = face_normal;
highlighted_ = face_highlighted;
pressed_ = face_pressed;
return true;
}
void Button::Paint(pp::ImageData* image_data, const pp::Rect& rc) {
if (!visible())
return;
pp::Rect draw_rc = rc.Intersect(rect());
if (draw_rc.IsEmpty())
return;
pp::Point origin = draw_rc.point();
draw_rc.Offset(-rect().x(), -rect().y());
AlphaBlend(GetCurrentImage(), draw_rc, image_data, origin, transparency());
}
bool Button::HandleEvent(const pp::InputEvent& event) {
if (!visible())
return false;
// Button handles mouse events only.
pp::MouseInputEvent mouse_event(event);
if (mouse_event.is_null())
return false;
pp::Point pt = mouse_event.GetPosition();
if (!rect().Contains(pt) ||
event.GetType() == PP_INPUTEVENT_TYPE_MOUSELEAVE) {
ChangeState(BUTTON_NORMAL, false);
owner()->SetEventCapture(id(), false);
return false;
}
owner()->SetCursor(id(), PP_CURSORTYPE_POINTER);
owner()->SetEventCapture(id(), true);
bool handled = true;
switch (event.GetType()) {
case PP_INPUTEVENT_TYPE_MOUSEMOVE:
if (state_ == BUTTON_NORMAL)
ChangeState(BUTTON_HIGHLIGHTED, false);
break;
case PP_INPUTEVENT_TYPE_MOUSEDOWN:
if (mouse_event.GetButton() == PP_INPUTEVENT_MOUSEBUTTON_LEFT) {
ChangeState(BUTTON_PRESSED, false);
is_pressed_ = true;
}
break;
case PP_INPUTEVENT_TYPE_MOUSEUP:
if (mouse_event.GetButton() == PP_INPUTEVENT_MOUSEBUTTON_LEFT &&
is_pressed_) {
OnButtonClicked();
is_pressed_ = false;
} else {
// Since button has not been pressed, return false to allow other
// controls (scrollbar) to process mouse button up.
return false;
}
break;
default:
handled = false;
break;
}
return handled;
}
void Button::OnEventCaptureReleased() {
ChangeState(BUTTON_NORMAL, false);
}
void Button::Show(bool visible, bool invalidate) {
// If button become invisible, remove pressed flag.
if (!visible)
is_pressed_ = false;
Control::Show(visible, invalidate);
}
void Button::AdjustTransparency(uint8 transparency, bool invalidate) {
// If button become invisible, remove pressed flag.
if (transparency == kTransparentAlpha)
is_pressed_ = false;
Control::AdjustTransparency(transparency, invalidate);
}
void Button::SetPressedState(bool pressed) {
if (style_ == BUTTON_STATE) {
if (IsPressed() != pressed)
ChangeState(pressed ? BUTTON_PRESSED_STICKY : BUTTON_NORMAL, true);
}
}
const pp::ImageData& Button::GetCurrentImage() {
switch (state_) {
case BUTTON_NORMAL: return normal_;
case BUTTON_HIGHLIGHTED: return highlighted_;
case BUTTON_PRESSED:
case BUTTON_PRESSED_STICKY: return pressed_;
}
NOTREACHED();
return normal_;
}
void Button::ChangeState(ButtonState new_state, bool force) {
if (style_ == BUTTON_STATE && !force) {
// If button is a state button and pressed state is sticky,
// user have to click on this button again to unpress it.
if ((state_ == BUTTON_PRESSED_STICKY && new_state != BUTTON_PRESSED_STICKY)
||
(state_ != BUTTON_PRESSED_STICKY && new_state == BUTTON_PRESSED_STICKY))
return;
}
if (state_ != new_state) {
state_ = new_state;
owner()->Invalidate(id(), rect());
}
}
void Button::OnButtonClicked() {
switch (style_) {
case BUTTON_CLICKABLE:
ChangeState(BUTTON_HIGHLIGHTED, true);
owner()->OnEvent(id(), EVENT_ID_BUTTON_CLICKED, NULL);
break;
case BUTTON_STATE:
SetPressedState(!IsPressed());
owner()->OnEvent(id(), EVENT_ID_BUTTON_STATE_CHANGED, NULL);
break;
default:
NOTREACHED();
}
}
} // namespace chrome_pdf
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