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-rw-r--r--widget/ScrollbarDrawingWin.cpp173
1 files changed, 173 insertions, 0 deletions
diff --git a/widget/ScrollbarDrawingWin.cpp b/widget/ScrollbarDrawingWin.cpp
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+++ b/widget/ScrollbarDrawingWin.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 "ScrollbarDrawingWin.h"
+
+#include "mozilla/gfx/Helpers.h"
+#include "mozilla/Maybe.h"
+#include "mozilla/StaticPrefs_widget.h"
+#include "nsLayoutUtils.h"
+#include "Theme.h"
+#include "nsNativeTheme.h"
+
+namespace mozilla::widget {
+
+LayoutDeviceIntSize ScrollbarDrawingWin::GetMinimumWidgetSize(
+ nsPresContext* aPresContext, StyleAppearance aAppearance,
+ nsIFrame* aFrame) {
+ MOZ_ASSERT(nsNativeTheme::IsWidgetScrollbarPart(aAppearance));
+
+ switch (aAppearance) {
+ case StyleAppearance::ScrollbarbuttonUp:
+ case StyleAppearance::ScrollbarbuttonDown:
+ case StyleAppearance::ScrollbarbuttonLeft:
+ case StyleAppearance::ScrollbarbuttonRight:
+ // For scrollbar-width:thin, we don't display the buttons.
+ if (IsScrollbarWidthThin(aFrame)) {
+ return LayoutDeviceIntSize{};
+ }
+ [[fallthrough]];
+ case StyleAppearance::ScrollbarVertical:
+ case StyleAppearance::ScrollbarHorizontal:
+ case StyleAppearance::ScrollbarthumbVertical:
+ case StyleAppearance::ScrollbarthumbHorizontal: {
+ // TODO: for short scrollbars it could be nice if the thumb could shrink
+ // under this size.
+ auto relevantSize = GetScrollbarSize(aPresContext, aFrame);
+ const bool isHorizontal =
+ aAppearance == StyleAppearance::ScrollbarHorizontal ||
+ aAppearance == StyleAppearance::ScrollbarthumbHorizontal ||
+ aAppearance == StyleAppearance::ScrollbarbuttonLeft ||
+ aAppearance == StyleAppearance::ScrollbarbuttonRight;
+ auto size = LayoutDeviceIntSize{relevantSize, relevantSize};
+ if (aAppearance == StyleAppearance::ScrollbarHorizontal ||
+ aAppearance == StyleAppearance::ScrollbarVertical) {
+ // Always reserve some space in the right direction. Historically we've
+ // reserved 2 times the size in the other axis (for the buttons).
+ // We do this even when painting thin scrollbars just for consistency,
+ // though there just one would probably do there.
+ if (isHorizontal) {
+ size.width *= 2;
+ } else {
+ size.height *= 2;
+ }
+ }
+ return size;
+ }
+ default:
+ return LayoutDeviceIntSize{};
+ }
+}
+
+// Returns the style for custom scrollbar if the scrollbar part frame should
+// use the custom drawing path, nullptr otherwise.
+const ComputedStyle* GetCustomScrollbarStyle(nsIFrame* aFrame) {
+ const ComputedStyle* style = nsLayoutUtils::StyleForScrollbar(aFrame);
+ if (style->StyleUI()->HasCustomScrollbars() ||
+ ScrollbarDrawing::IsScrollbarWidthThin(*style)) {
+ return style;
+ }
+ bool useDarkScrollbar = !StaticPrefs::widget_disable_dark_scrollbar() &&
+ nsNativeTheme::IsDarkBackgroundForScrollbar(aFrame);
+ if (useDarkScrollbar) {
+ return style;
+ }
+ return nullptr;
+}
+
+Maybe<nsITheme::Transparency> ScrollbarDrawingWin::GetScrollbarPartTransparency(
+ nsIFrame* aFrame, StyleAppearance aAppearance) {
+ if (nsNativeTheme::IsWidgetScrollbarPart(aAppearance)) {
+ if (const ComputedStyle* style = GetCustomScrollbarStyle(aFrame)) {
+ auto* ui = style->StyleUI();
+ if (ui->mScrollbarColor.IsAuto() ||
+ ui->mScrollbarColor.AsColors().track.MaybeTransparent()) {
+ return Some(nsITheme::eTransparent);
+ }
+ // These widgets may be thinner than the track, so we need to return
+ // transparent for them to make the track visible.
+ switch (aAppearance) {
+ case StyleAppearance::ScrollbarthumbHorizontal:
+ case StyleAppearance::ScrollbarthumbVertical:
+ case StyleAppearance::ScrollbarbuttonUp:
+ case StyleAppearance::ScrollbarbuttonDown:
+ case StyleAppearance::ScrollbarbuttonLeft:
+ case StyleAppearance::ScrollbarbuttonRight:
+ return Some(nsITheme::eTransparent);
+ default:
+ break;
+ }
+ }
+ if (aFrame->PresContext()->UseOverlayScrollbars()) {
+ return Some(nsITheme::eTransparent);
+ }
+ }
+
+ switch (aAppearance) {
+ case StyleAppearance::ScrollbarHorizontal:
+ case StyleAppearance::ScrollbarVertical:
+ case StyleAppearance::Scrollcorner:
+ // Knowing that scrollbars and statusbars are opaque improves
+ // performance, because we create layers for them. This better be
+ // true across all Windows themes! If it's not true, we should
+ // paint an opaque background for them to make it true!
+ // TODO(emilio): Unclear how much this optimization matters in practice
+ // now we're in a WR-only world.
+ return Some(nsITheme::eOpaque);
+ default:
+ break;
+ }
+
+ return Nothing();
+}
+
+template <typename PaintBackendData>
+bool ScrollbarDrawingWin::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);
+ ThemeDrawing::FillRect(aPaintData, aRect, thumbColor);
+ return true;
+}
+
+bool ScrollbarDrawingWin::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 ScrollbarDrawingWin::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);
+}
+
+void ScrollbarDrawingWin::RecomputeScrollbarParams() {
+ uint32_t defaultSize = kDefaultWinScrollbarSize;
+ uint32_t overrideSize =
+ StaticPrefs::widget_non_native_theme_scrollbar_size_override();
+ if (overrideSize > 0) {
+ defaultSize = overrideSize;
+ }
+ ConfigureScrollbarSize(defaultSize);
+
+ if (StaticPrefs::widget_non_native_theme_win_scrollbar_use_system_size()) {
+ ConfigureScrollbarSize(LookAndFeel::GetInt(
+ LookAndFeel::IntID::SystemScrollbarSize, defaultSize));
+ }
+}
+
+} // namespace mozilla::widget