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/* -*- Mode: C++; tab-width: 40; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "ScrollbarDrawingGTK.h"
#include "mozilla/gfx/Helpers.h"
#include "mozilla/StaticPrefs_widget.h"
#include "nsLayoutUtils.h"
#include "nsNativeTheme.h"
using namespace mozilla;
using namespace mozilla::gfx;
using namespace mozilla::widget;
LayoutDeviceIntSize ScrollbarDrawingGTK::GetMinimumWidgetSize(
nsPresContext* aPresContext, StyleAppearance aAppearance,
nsIFrame* aFrame) {
MOZ_ASSERT(nsNativeTheme::IsWidgetScrollbarPart(aAppearance));
auto scrollbarSize = GetScrollbarSize(aPresContext, aFrame);
LayoutDeviceIntSize size{scrollbarSize, scrollbarSize};
if (aAppearance == StyleAppearance::ScrollbarHorizontal ||
aAppearance == StyleAppearance::ScrollbarVertical ||
aAppearance == StyleAppearance::ScrollbarthumbHorizontal ||
aAppearance == StyleAppearance::ScrollbarthumbVertical) {
CSSCoord thumbSize(
StaticPrefs::widget_non_native_theme_gtk_scrollbar_thumb_cross_size());
const bool isVertical =
aAppearance == StyleAppearance::ScrollbarVertical ||
aAppearance == StyleAppearance::ScrollbarthumbVertical;
auto dpi = GetDPIRatioForScrollbarPart(aPresContext);
if (isVertical) {
size.height = thumbSize * dpi;
} else {
size.width = thumbSize * dpi;
}
}
return size;
}
Maybe<nsITheme::Transparency> ScrollbarDrawingGTK::GetScrollbarPartTransparency(
nsIFrame* aFrame, StyleAppearance aAppearance) {
if (!aFrame->PresContext()->UseOverlayScrollbars() &&
(aAppearance == StyleAppearance::ScrollbarVertical ||
aAppearance == StyleAppearance::ScrollbarHorizontal) &&
IsScrollbarTrackOpaque(aFrame)) {
return Some(nsITheme::eOpaque);
}
return Nothing();
}
template <typename PaintBackendData>
bool ScrollbarDrawingGTK::DoPaintScrollbarThumb(
PaintBackendData& aPaintData, const LayoutDeviceRect& aRect,
ScrollbarKind aScrollbarKind, nsIFrame* aFrame, const ComputedStyle& aStyle,
const ElementState& aElementState, const DocumentState& aDocumentState,
const Colors& aColors, const DPIRatio& aDpiRatio) {
sRGBColor thumbColor = ComputeScrollbarThumbColor(
aFrame, aStyle, aElementState, aDocumentState, aColors);
LayoutDeviceRect thumbRect(aRect);
const bool horizontal = aScrollbarKind == ScrollbarKind::Horizontal;
if (aFrame->PresContext()->UseOverlayScrollbars() &&
!ScrollbarDrawing::IsParentScrollbarHoveredOrActive(aFrame)) {
if (horizontal) {
thumbRect.height *= 0.5;
thumbRect.y += thumbRect.height;
} else {
thumbRect.width *= 0.5;
if (aScrollbarKind == ScrollbarKind::VerticalRight) {
thumbRect.x += thumbRect.width;
}
}
}
{
float factor = std::max(
0.0f,
1.0f - StaticPrefs::widget_non_native_theme_gtk_scrollbar_thumb_size());
thumbRect.Deflate((horizontal ? thumbRect.height : thumbRect.width) *
factor);
}
LayoutDeviceCoord radius =
StaticPrefs::widget_non_native_theme_gtk_scrollbar_round_thumb()
? (horizontal ? thumbRect.height : thumbRect.width) / 2.0f
: 0.0f;
ThemeDrawing::PaintRoundedRectWithRadius(aPaintData, thumbRect, thumbColor,
sRGBColor(), 0, radius / aDpiRatio,
aDpiRatio);
return true;
}
bool ScrollbarDrawingGTK::PaintScrollbarThumb(
DrawTarget& aDrawTarget, const LayoutDeviceRect& aRect,
ScrollbarKind aScrollbarKind, nsIFrame* aFrame, const ComputedStyle& aStyle,
const ElementState& aElementState, const DocumentState& aDocumentState,
const Colors& aColors, const DPIRatio& aDpiRatio) {
return DoPaintScrollbarThumb(aDrawTarget, aRect, aScrollbarKind, aFrame,
aStyle, aElementState, aDocumentState, aColors,
aDpiRatio);
}
bool ScrollbarDrawingGTK::PaintScrollbarThumb(
WebRenderBackendData& aWrData, const LayoutDeviceRect& aRect,
ScrollbarKind aScrollbarKind, nsIFrame* aFrame, const ComputedStyle& aStyle,
const ElementState& aElementState, const DocumentState& aDocumentState,
const Colors& aColors, const DPIRatio& aDpiRatio) {
return DoPaintScrollbarThumb(aWrData, aRect, aScrollbarKind, aFrame, aStyle,
aElementState, aDocumentState, aColors,
aDpiRatio);
}
bool ScrollbarDrawingGTK::ShouldDrawScrollbarButtons() {
if (StaticPrefs::widget_non_native_theme_enabled()) {
return StaticPrefs::widget_non_native_theme_gtk_scrollbar_allow_buttons();
}
return true;
}
void ScrollbarDrawingGTK::RecomputeScrollbarParams() {
uint32_t defaultSize = 12;
uint32_t overrideSize =
StaticPrefs::widget_non_native_theme_scrollbar_size_override();
if (overrideSize > 0) {
defaultSize = overrideSize;
}
ConfigureScrollbarSize(defaultSize);
}
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