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// Copyright 2012 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "ui/views/controls/button/label_button_border.h"
#include <utility>
#include <variant>
#include "cc/paint/paint_flags.h"
#include "ui/gfx/animation/animation.h"
#include "ui/gfx/canvas.h"
#include "ui/gfx/geometry/rect.h"
#include "ui/gfx/geometry/skia_conversions.h"
#include "ui/gfx/sys_color_change_listener.h"
#include "ui/native_theme/native_theme.h"
#include "ui/views/border.h"
#include "ui/views/controls/button/label_button.h"
#include "ui/views/layout/layout_provider.h"
#include "ui/views/native_theme_delegate.h"
#include "ui/views/resources/grit/views_resources.h"
namespace views {
namespace {
// The text-button hot and pushed image IDs; normal is unadorned by default.
constexpr int kTextHoveredImages[] = IMAGE_GRID(IDR_TEXTBUTTON_HOVER);
constexpr int kTextPressedImages[] = IMAGE_GRID(IDR_TEXTBUTTON_PRESSED);
// A helper function to paint the appropriate broder images.
void PaintHelper(LabelButtonAssetBorder* border,
gfx::Canvas* canvas,
ui::NativeTheme::State state,
const gfx::Rect& rect,
const ui::NativeTheme::ExtraParams& extra) {
const auto& button = std::get<ui::NativeTheme::ButtonExtraParams>(extra);
Painter* painter =
border->GetPainter(button.is_focused, Button::GetButtonStateFrom(state));
// Paint any corresponding unfocused painter if there is no focused painter.
if (!painter && button.is_focused) {
painter = border->GetPainter(false, Button::GetButtonStateFrom(state));
}
if (painter) {
Painter::PaintPainterAt(canvas, painter, rect);
}
}
} // namespace
LabelButtonBorder::LabelButtonBorder() = default;
LabelButtonBorder::~LabelButtonBorder() = default;
bool LabelButtonBorder::PaintsButtonState(bool focused,
Button::ButtonState state) {
return false;
}
void LabelButtonBorder::Paint(const View& view, gfx::Canvas* canvas) {}
gfx::Insets LabelButtonBorder::GetInsets() const {
return insets_;
}
gfx::Size LabelButtonBorder::GetMinimumSize() const {
return gfx::Size();
}
LabelButtonAssetBorder::LabelButtonAssetBorder() {
set_insets(GetDefaultInsets());
SetPainter(false, Button::STATE_HOVERED,
Painter::CreateImageGridPainter(kTextHoveredImages));
SetPainter(false, Button::STATE_PRESSED,
Painter::CreateImageGridPainter(kTextPressedImages));
}
LabelButtonAssetBorder::~LabelButtonAssetBorder() = default;
// static
gfx::Insets LabelButtonAssetBorder::GetDefaultInsets() {
return LayoutProvider::Get()->GetInsetsMetric(
InsetsMetric::INSETS_LABEL_BUTTON);
}
bool LabelButtonAssetBorder::PaintsButtonState(bool focused,
Button::ButtonState state) {
// PaintHelper() above will paint the unfocused painter for a given state if
// the button is focused, but there is no focused painter.
return GetPainter(focused, state) || (focused && GetPainter(false, state));
}
void LabelButtonAssetBorder::Paint(const View& view, gfx::Canvas* canvas) {
const NativeThemeDelegate* native_theme_delegate =
static_cast<const LabelButton*>(&view);
gfx::Rect rect(native_theme_delegate->GetThemePaintRect());
ui::NativeTheme::ExtraParams extra(
std::in_place_type<ui::NativeTheme::ButtonExtraParams>);
const gfx::Animation* animation = native_theme_delegate->GetThemeAnimation();
ui::NativeTheme::State state = native_theme_delegate->GetThemeState(&extra);
if (animation && animation->is_animating()) {
// Linearly interpolate background and foreground painters during animation.
uint8_t fg_alpha =
static_cast<uint8_t>(animation->CurrentValueBetween(0, 255));
const SkRect sk_rect = gfx::RectToSkRect(rect);
cc::PaintCanvasAutoRestore auto_restore(canvas->sk_canvas(), false);
canvas->sk_canvas()->saveLayer(sk_rect, cc::PaintFlags());
{
// First, modulate the background by 1 - alpha.
cc::PaintCanvasAutoRestore auto_restore_alpha(canvas->sk_canvas(), false);
canvas->SaveLayerAlpha(255 - fg_alpha, rect);
state = native_theme_delegate->GetBackgroundThemeState(&extra);
PaintHelper(this, canvas, state, rect, extra);
}
// Then modulate the foreground by alpha, and blend using kPlus_Mode.
cc::PaintFlags flags;
flags.setAlphaf(fg_alpha / 255.0f);
flags.setBlendMode(SkBlendMode::kPlus);
canvas->sk_canvas()->saveLayer(sk_rect, flags);
state = native_theme_delegate->GetForegroundThemeState(&extra);
PaintHelper(this, canvas, state, rect, extra);
} else {
PaintHelper(this, canvas, state, rect, extra);
}
}
gfx::Size LabelButtonAssetBorder::GetMinimumSize() const {
gfx::Size minimum_size;
for (const auto& painters_for_focus_state : painters_) {
for (const auto& painter_for_button_state : painters_for_focus_state) {
if (painter_for_button_state) {
minimum_size.SetToMax(painter_for_button_state->GetMinimumSize());
}
}
}
return minimum_size;
}
Painter* LabelButtonAssetBorder::GetPainter(bool focused,
Button::ButtonState state) {
return painters_[focused ? 1 : 0][state].get();
}
void LabelButtonAssetBorder::SetPainter(bool focused,
Button::ButtonState state,
std::unique_ptr<Painter> painter) {
painters_[focused ? 1 : 0][state] = std::move(painter);
}
} // namespace views
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