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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 "ScrollbarDrawingAndroid.h"
#include "nsIFrame.h"
#include "nsNativeTheme.h"
#include "mozilla/StaticPrefs_widget.h"
using namespace mozilla;
using namespace mozilla::widget;
LayoutDeviceIntSize ScrollbarDrawingAndroid::GetMinimumWidgetSize(
nsPresContext* aPresContext, StyleAppearance aAppearance,
nsIFrame* aFrame) {
MOZ_ASSERT(nsNativeTheme::IsWidgetScrollbarPart(aAppearance));
auto sizes =
GetScrollbarSizes(aPresContext, StyleScrollbarWidth::Auto, Overlay::Yes);
MOZ_ASSERT(sizes.mHorizontal == sizes.mVertical);
return LayoutDeviceIntSize{sizes.mHorizontal, sizes.mVertical};
}
auto ScrollbarDrawingAndroid::GetScrollbarSizes(nsPresContext* aPresContext,
StyleScrollbarWidth aWidth,
Overlay aOverlay)
-> ScrollbarSizes {
// We force auto-width scrollbars because scrollbars on android are already
// thin enough.
return ScrollbarDrawing::GetScrollbarSizes(
aPresContext, StyleScrollbarWidth::Auto, aOverlay);
}
template <typename PaintBackendData>
void ScrollbarDrawingAndroid::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) {
// TODO(emilio): Maybe do like macOS and draw a stroke?
const auto color = ComputeScrollbarThumbColor(aFrame, aStyle, aElementState,
aDocumentState, aColors);
const bool horizontal = aScrollbarKind == ScrollbarKind::Horizontal;
// Draw the thumb rect centered in the scrollbar.
LayoutDeviceRect thumbRect(aRect);
if (horizontal) {
thumbRect.height *= 0.5f;
thumbRect.y += thumbRect.height * 0.5f;
} else {
thumbRect.width *= 0.5f;
thumbRect.x += thumbRect.width * 0.5f;
}
const LayoutDeviceCoord radius =
(horizontal ? thumbRect.height : thumbRect.width) / 2.0f;
ThemeDrawing::PaintRoundedRectWithRadius(aPaintData, thumbRect, color,
sRGBColor::White(0.0f), 0.0f,
radius / aDpiRatio, aDpiRatio);
}
bool ScrollbarDrawingAndroid::PaintScrollbarThumb(
DrawTarget& aDt, const LayoutDeviceRect& aRect,
ScrollbarKind aScrollbarKind, nsIFrame* aFrame, const ComputedStyle& aStyle,
const ElementState& aElementState, const DocumentState& aDocumentState,
const Colors& aColors, const DPIRatio& aDpiRatio) {
DoPaintScrollbarThumb(aDt, aRect, aScrollbarKind, aFrame, aStyle,
aElementState, aDocumentState, aColors, aDpiRatio);
return true;
}
bool ScrollbarDrawingAndroid::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) {
DoPaintScrollbarThumb(aWrData, aRect, aScrollbarKind, aFrame, aStyle,
aElementState, aDocumentState, aColors, aDpiRatio);
return true;
}
void ScrollbarDrawingAndroid::RecomputeScrollbarParams() {
uint32_t defaultSize = 6;
uint32_t overrideSize =
StaticPrefs::widget_non_native_theme_scrollbar_size_override();
if (overrideSize > 0) {
defaultSize = overrideSize;
}
mHorizontalScrollbarHeight = mVerticalScrollbarWidth = defaultSize;
}
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