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-rw-r--r--widget/ScrollbarDrawingAndroid.cpp84
1 files changed, 84 insertions, 0 deletions
diff --git a/widget/ScrollbarDrawingAndroid.cpp b/widget/ScrollbarDrawingAndroid.cpp
new file mode 100644
index 0000000000..29ad917a91
--- /dev/null
+++ b/widget/ScrollbarDrawingAndroid.cpp
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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 size =
+ GetScrollbarSize(aPresContext, StyleScrollbarWidth::Auto, Overlay::Yes);
+ return LayoutDeviceIntSize{size, size};
+}
+
+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;
+ }
+ ConfigureScrollbarSize(defaultSize);
+ // We make thin scrollbars as wide as auto ones because auto scrollbars on
+ // android are already thin enough.
+ ConfigureScrollbarSize(StyleScrollbarWidth::Thin, Overlay::Yes, defaultSize);
+ ConfigureScrollbarSize(StyleScrollbarWidth::Thin, Overlay::No, defaultSize);
+}