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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.
#include "ui/views/controls/link.h"
#include "build/build_config.h"
#include "base/logging.h"
#include "base/strings/utf_string_conversions.h"
#include "ui/base/accessibility/accessible_view_state.h"
#include "ui/base/events/event.h"
#include "ui/base/keycodes/keyboard_codes.h"
#include "ui/gfx/color_utils.h"
#include "ui/gfx/font.h"
#include "ui/views/controls/link_listener.h"
#if defined(USE_AURA)
#include "ui/base/cursor/cursor.h"
#endif
namespace views {
const char Link::kViewClassName[] = "Link";
Link::Link() : Label(string16()) {
Init();
}
Link::Link(const string16& title) : Label(title) {
Init();
}
Link::~Link() {
}
SkColor Link::GetDefaultEnabledColor() {
#if defined(OS_WIN)
return color_utils::GetSysSkColor(COLOR_HOTLIGHT);
#else
return SkColorSetRGB(0, 51, 153);
#endif
}
void Link::OnEnabledChanged() {
RecalculateFont();
View::OnEnabledChanged();
}
const char* Link::GetClassName() const {
return kViewClassName;
}
gfx::NativeCursor Link::GetCursor(const ui::MouseEvent& event) {
if (!enabled())
return gfx::kNullCursor;
#if defined(USE_AURA)
return ui::kCursorHand;
#elif defined(OS_WIN)
static HCURSOR g_hand_cursor = LoadCursor(NULL, IDC_HAND);
return g_hand_cursor;
#endif
}
bool Link::HitTestRect(const gfx::Rect& rect) const {
// We need to allow clicks on the link. So we override the implementation in
// Label and use the default implementation of View.
return View::HitTestRect(rect);
}
bool Link::OnMousePressed(const ui::MouseEvent& event) {
if (!enabled() ||
(!event.IsLeftMouseButton() && !event.IsMiddleMouseButton()))
return false;
SetPressed(true);
return true;
}
bool Link::OnMouseDragged(const ui::MouseEvent& event) {
SetPressed(enabled() &&
(event.IsLeftMouseButton() || event.IsMiddleMouseButton()) &&
HitTestPoint(event.location()));
return true;
}
void Link::OnMouseReleased(const ui::MouseEvent& event) {
// Change the highlight first just in case this instance is deleted
// while calling the controller
OnMouseCaptureLost();
if (enabled() &&
(event.IsLeftMouseButton() || event.IsMiddleMouseButton()) &&
HitTestPoint(event.location())) {
// Focus the link on click.
RequestFocus();
if (listener_)
listener_->LinkClicked(this, event.flags());
}
}
void Link::OnMouseCaptureLost() {
SetPressed(false);
}
bool Link::OnKeyPressed(const ui::KeyEvent& event) {
bool activate = ((event.key_code() == ui::VKEY_SPACE) ||
(event.key_code() == ui::VKEY_RETURN));
if (!activate)
return false;
SetPressed(false);
// Focus the link on key pressed.
RequestFocus();
if (listener_)
listener_->LinkClicked(this, event.flags());
return true;
}
bool Link::SkipDefaultKeyEventProcessing(const ui::KeyEvent& event) {
// Make sure we don't process space or enter as accelerators.
return (event.key_code() == ui::VKEY_SPACE) ||
(event.key_code() == ui::VKEY_RETURN);
}
void Link::GetAccessibleState(ui::AccessibleViewState* state) {
Label::GetAccessibleState(state);
state->role = ui::AccessibilityTypes::ROLE_LINK;
}
void Link::OnGestureEvent(ui::GestureEvent* event) {
if (!enabled())
return;
if (event->type() == ui::ET_GESTURE_TAP_DOWN) {
SetPressed(true);
} else if (event->type() == ui::ET_GESTURE_TAP) {
RequestFocus();
if (listener_)
listener_->LinkClicked(this, event->flags());
} else {
SetPressed(false);
return;
}
event->SetHandled();
}
void Link::SetFont(const gfx::Font& font) {
Label::SetFont(font);
RecalculateFont();
}
void Link::SetEnabledColor(SkColor color) {
requested_enabled_color_ = color;
if (!pressed_)
Label::SetEnabledColor(requested_enabled_color_);
}
void Link::SetPressedColor(SkColor color) {
requested_pressed_color_ = color;
if (pressed_)
Label::SetEnabledColor(requested_pressed_color_);
}
void Link::SetUnderline(bool underline) {
if (underline_ == underline)
return;
underline_ = underline;
RecalculateFont();
}
void Link::Init() {
listener_ = NULL;
pressed_ = false;
underline_ = true;
SetEnabledColor(GetDefaultEnabledColor());
#if defined(OS_WIN)
SetDisabledColor(color_utils::GetSysSkColor(COLOR_WINDOWTEXT));
SetPressedColor(SkColorSetRGB(200, 0, 0));
#else
// TODO(beng): source from theme provider.
SetDisabledColor(SK_ColorBLACK);
SetPressedColor(SK_ColorRED);
#endif
RecalculateFont();
set_focusable(true);
}
void Link::SetPressed(bool pressed) {
if (pressed_ != pressed) {
pressed_ = pressed;
Label::SetEnabledColor(pressed_ ?
requested_pressed_color_ : requested_enabled_color_);
RecalculateFont();
SchedulePaint();
}
}
void Link::RecalculateFont() {
// Underline the link iff it is enabled and |underline_| is true.
const int style = font().GetStyle();
const int intended_style = (enabled() && underline_) ?
(style | gfx::Font::UNDERLINE) : (style & ~gfx::Font::UNDERLINE);
if (style != intended_style)
Label::SetFont(font().DeriveFont(0, intended_style));
}
} // namespace views
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