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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/accessibility/ax_view_state.h"
#include "ui/base/cursor/cursor.h"
#include "ui/base/material_design/material_design_controller.h"
#include "ui/events/event.h"
#include "ui/events/keycodes/keyboard_codes.h"
#include "ui/gfx/canvas.h"
#include "ui/gfx/color_palette.h"
#include "ui/gfx/color_utils.h"
#include "ui/gfx/font_list.h"
#include "ui/native_theme/native_theme.h"
#include "ui/views/controls/link_listener.h"
#include "ui/views/native_cursor.h"
namespace views {
const char Link::kViewClassName[] = "Link";
Link::Link() : Link(base::string16()) {}
Link::Link(const base::string16& title)
: Label(title),
requested_enabled_color_(gfx::kPlaceholderColor),
requested_enabled_color_set_(false),
requested_pressed_color_(gfx::kPlaceholderColor),
requested_pressed_color_set_(false) {
Init();
}
Link::~Link() {
}
const char* Link::GetClassName() const {
return kViewClassName;
}
gfx::NativeCursor Link::GetCursor(const ui::MouseEvent& event) {
if (!enabled())
return gfx::kNullCursor;
return GetNativeHandCursor();
}
bool Link::CanProcessEventsWithinSubtree() const {
// Links need to be able to accept events (e.g., clicking) even though
// in general Labels do not.
return View::CanProcessEventsWithinSubtree();
}
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.flags() & ui::EF_ALT_DOWN) == 0) ||
(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;
}
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();
}
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::AXViewState* state) {
Label::GetAccessibleState(state);
state->role = ui::AX_ROLE_LINK;
}
void Link::OnEnabledChanged() {
RecalculateFont();
View::OnEnabledChanged();
}
void Link::OnFocus() {
Label::OnFocus();
// We render differently focused.
SchedulePaint();
}
void Link::OnBlur() {
Label::OnBlur();
// We render differently focused.
SchedulePaint();
}
void Link::SetFontList(const gfx::FontList& font_list) {
Label::SetFontList(font_list);
RecalculateFont();
}
void Link::SetText(const base::string16& text) {
Label::SetText(text);
// Disable focusability for empty links. Otherwise Label::GetInsets() will
// give them an unconditional 1-px. inset on every side to allow for a focus
// border, when in this case we probably wanted zero width.
SetFocusable(!text.empty());
}
void Link::OnNativeThemeChanged(const ui::NativeTheme* theme) {
Label::SetEnabledColor(GetEnabledColor());
SetDisabledColor(
theme->GetSystemColor(ui::NativeTheme::kColorId_LinkDisabled));
}
void Link::SetEnabledColor(SkColor color) {
requested_enabled_color_set_ = true;
requested_enabled_color_ = color;
Label::SetEnabledColor(GetEnabledColor());
}
void Link::SetPressedColor(SkColor color) {
requested_pressed_color_set_ = true;
requested_pressed_color_ = color;
Label::SetEnabledColor(GetEnabledColor());
}
void Link::SetUnderline(bool underline) {
if (underline_ == underline)
return;
underline_ = underline;
RecalculateFont();
}
void Link::Init() {
listener_ = NULL;
pressed_ = false;
underline_ = true;
RecalculateFont();
// Label::Init() calls SetText(), but if that's being called from Label(), our
// SetText() override will not be reached (because the constructed class is
// only a Label at the moment, not yet a Link). So so the set_focusable()
// call explicitly here.
SetFocusable(!text().empty());
}
void Link::SetPressed(bool pressed) {
if (pressed_ != pressed) {
pressed_ = pressed;
Label::SetEnabledColor(GetEnabledColor());
RecalculateFont();
SchedulePaint();
}
}
void Link::RecalculateFont() {
// Underline the link iff it is enabled and |underline_| is true.
const int style = font_list().GetFontStyle();
const int intended_style = (enabled() && underline_) ?
(style | gfx::Font::UNDERLINE) : (style & ~gfx::Font::UNDERLINE);
if (style != intended_style)
Label::SetFontList(font_list().DeriveWithStyle(intended_style));
}
SkColor Link::GetEnabledColor() {
// In material mode, there is no pressed effect, so always use the unpressed
// color.
if (!pressed_ || ui::MaterialDesignController::IsModeMaterial()) {
if (!requested_enabled_color_set_ && GetNativeTheme())
return GetNativeTheme()->GetSystemColor(
ui::NativeTheme::kColorId_LinkEnabled);
return requested_enabled_color_;
}
if (!requested_pressed_color_set_ && GetNativeTheme())
return GetNativeTheme()->GetSystemColor(
ui::NativeTheme::kColorId_LinkPressed);
return requested_pressed_color_;
}
} // namespace views
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