Allow the user to select the scrollbar setting graphically.

This uses custom controls to allow the user to choose between
single and double arrows and none, dots, or line knob styles
in a graphical fashion copied from BeOS Scrollbar preflet.

src/preferences/appearance/FakeScrollBar.cpp

@@ -0,0 +1,348 @@
+/*
+ *  Copyright 2010-2012 Haiku, Inc. All rights reserved.
+ *  Distributed under the terms of the MIT license.
+ *
+ *	Authors:
+ *		DarkWyrm <[email protected]>
+ *		John Scipione <[email protected]>
+ */
+
+
+#include "FakeScrollBar.h"
+
+#include <Box.h>
+#include <ControlLook.h>
+#include <Message.h>
+#include <ScrollBar.h>
+#include <Shape.h>
+#include <Size.h>
+#include <Window.h>
+
+
+typedef enum {
+	ARROW_LEFT = 0,
+	ARROW_RIGHT,
+	ARROW_UP,
+	ARROW_DOWN,
+	ARROW_NONE
+} arrow_direction;
+
+
+FakeScrollBar::FakeScrollBar(bool drawArrows, bool doubleArrows,
+	int32 knobStyle, BMessage* message)
+	:
+	BControl("FakeScrollBar", NULL, message, B_WILL_DRAW),
+	fDrawArrows(drawArrows),
+	fDoubleArrows(doubleArrows),
+	fKnobStyle(knobStyle)
+{
+	SetExplicitMinSize(BSize(160, 20));
+	SetExplicitMaxSize(BSize(B_SIZE_UNLIMITED, 20));
+}
+
+
+FakeScrollBar::~FakeScrollBar(void)
+{
+}
+
+
+void
+FakeScrollBar::Draw(BRect updateRect)
+{
+	BRect bounds = Bounds();
+
+	rgb_color normal = ui_color(B_PANEL_BACKGROUND_COLOR);
+
+	if (Value() == B_CONTROL_ON)
+		SetHighColor(ui_color(B_CONTROL_MARK_COLOR));
+	else
+		SetHighColor(normal);
+
+	// Draw the selected border (2px)
+	StrokeRect(bounds);
+	bounds.InsetBy(1.0, 1.0);
+	StrokeRect(bounds);
+	bounds.InsetBy(1.0, 1.0);
+
+	// draw a gap (1px)
+	SetHighColor(normal);
+	StrokeRect(bounds);
+	bounds.InsetBy(1.0, 1.0);
+
+	// draw a border around control (1px)
+	SetHighColor(tint_color(normal, B_DARKEN_1_TINT));
+	StrokeRect(bounds);
+	bounds.InsetBy(1.0, 1.0);
+
+	BRect thumbBG = bounds;
+	BRect bgRect = bounds;
+
+	if (fDrawArrows) {
+		// draw arrows
+		SetDrawingMode(B_OP_OVER);
+
+		BRect buttonFrame(bounds.left, bounds.top,
+			bounds.left + bounds.Height(), bounds.bottom);
+
+		_DrawArrowButton(ARROW_LEFT, fDoubleArrows, buttonFrame, updateRect);
+
+		if (fDoubleArrows) {
+			buttonFrame.OffsetBy(bounds.Height() + 1, 0.0);
+			_DrawArrowButton(ARROW_RIGHT, fDoubleArrows, buttonFrame,
+				updateRect);
+
+			buttonFrame.OffsetTo(bounds.right - ((bounds.Height() * 2) + 1),
+				bounds.top);
+			_DrawArrowButton(ARROW_LEFT, fDoubleArrows, buttonFrame,
+				updateRect);
+
+			thumbBG.left += bounds.Height() * 2 + 2;
+			thumbBG.right -= bounds.Height() * 2 + 2;
+		} else {
+			thumbBG.left += bounds.Height() + 1;
+			thumbBG.right -= bounds.Height() + 1;
+		}
+
+		buttonFrame.OffsetTo(bounds.right - bounds.Height(), bounds.top);
+		_DrawArrowButton(ARROW_RIGHT, fDoubleArrows, buttonFrame, updateRect);
+
+		SetDrawingMode(B_OP_COPY);
+
+		bgRect = bounds.InsetByCopy(48, 0);
+	} else
+		bgRect = bounds.InsetByCopy(16, 0);
+
+	// fill background besides the thumb
+	BRect leftOfThumb(thumbBG.left, thumbBG.top, bgRect.left - 1,
+		thumbBG.bottom);
+	BRect rightOfThumb(bgRect.right + 1, thumbBG.top, thumbBG.right,
+		thumbBG.bottom);
+
+	be_control_look->DrawScrollBarBackground(this, leftOfThumb,
+		rightOfThumb, updateRect, normal, 0, B_HORIZONTAL);
+
+	// Draw scroll thumb
+
+	// fill the clickable surface of the thumb
+	be_control_look->DrawButtonBackground(this, bgRect, updateRect,
+		normal, 0, BControlLook::B_ALL_BORDERS, B_HORIZONTAL);
+
+	if (fKnobStyle == KNOB_STYLE_NONE)
+		return;
+
+	// draw the scrollbar thumb knobs
+	bool square = fKnobStyle == KNOB_STYLE_DOTS;
+	int32 hextent = 0;
+	int32 vextent = 0;
+
+	if (square) {
+		hextent = 2;
+		vextent = 2;
+	} else {
+		hextent = 1;
+		vextent = 3;
+	}
+
+	float hmiddle = bgRect.Width() / 2;
+	float vmiddle = bgRect.Height() / 2;
+
+	BRect middleKnob = BRect(bgRect.left + hmiddle - hextent,
+		bgRect.top + vmiddle - vextent,
+		bgRect.left + hmiddle + hextent,
+		bgRect.top + vmiddle + vextent);
+
+	BRect leftKnob = middleKnob.OffsetByCopy(hextent * -4, 0);
+	if (leftKnob.left > bgRect.left + hextent) {
+		be_control_look->DrawButtonBackground(this, leftKnob, updateRect,
+			normal, 0, BControlLook::B_ALL_BORDERS, B_HORIZONTAL);
+	}
+
+	BRect rightKnob = middleKnob.OffsetByCopy(hextent * 4, 0);
+	if (rightKnob.right < bgRect.right - hextent) {
+		be_control_look->DrawButtonBackground(this, rightKnob, updateRect,
+			normal, 0, BControlLook::B_ALL_BORDERS, B_HORIZONTAL);
+	}
+
+	// draw middle knob last because it modifies middleKnob
+	be_control_look->DrawButtonBackground(this, middleKnob, updateRect,
+		normal, 0, BControlLook::B_ALL_BORDERS, B_HORIZONTAL);
+}
+
+
+void
+FakeScrollBar::MouseDown(BPoint point)
+{
+	BControl::MouseDown(point);
+}
+
+
+void
+FakeScrollBar::MouseMoved(BPoint point, uint32 transit,
+	const BMessage* message)
+{
+	BControl::MouseMoved(point, transit, message);
+}
+
+
+void
+FakeScrollBar::MouseUp(BPoint point)
+{
+	SetValue(B_CONTROL_ON);
+	Invoke();
+
+	Invalidate();
+
+	BControl::MouseUp(point);
+}
+
+
+void
+FakeScrollBar::SetValue(int32 value)
+{
+	if (value != Value()) {
+		BControl::SetValueNoUpdate(value);
+		Invalidate();
+	}
+
+	if (!value)
+		return;
+
+	BView* parent = Parent();
+	BView* child = NULL;
+
+	if (parent != NULL) {
+		// If the parent is a BBox, the group parent is the parent of the BBox
+		BBox* box = dynamic_cast<BBox*>(parent);
+
+		if (box && box->LabelView() == this)
+			parent = box->Parent();
+
+		if (parent != NULL) {
+			BBox* box = dynamic_cast<BBox*>(parent);
+
+			// If the parent is a BBox, skip the label if there is one
+			if (box && box->LabelView())
+				child = parent->ChildAt(1);
+			else
+				child = parent->ChildAt(0);
+		} else
+			child = Window()->ChildAt(0);
+	} else if (Window())
+		child = Window()->ChildAt(0);
+
+	while (child) {
+		FakeScrollBar* scrollbar = dynamic_cast<FakeScrollBar*>(child);
+
+		if (scrollbar != NULL && (scrollbar != this))
+			scrollbar->SetValue(B_CONTROL_OFF);
+		else {
+			// If the child is a BBox, check if the label is a scrollbarbutton
+			BBox* box = dynamic_cast<BBox*>(child);
+
+			if (box && box->LabelView()) {
+				scrollbar = dynamic_cast<FakeScrollBar*>(box->LabelView());
+
+				if (scrollbar != NULL && (scrollbar != this))
+					scrollbar->SetValue(B_CONTROL_OFF);
+			}
+		}
+
+		child = child->NextSibling();
+	}
+
+	//ASSERT(Value() == B_CONTROL_ON);
+}
+
+
+//	#pragma mark -
+
+
+void
+FakeScrollBar::SetDoubleArrows(bool doublearrows)
+{
+	fDoubleArrows = doublearrows;
+	Invalidate();
+}
+
+
+void
+FakeScrollBar::SetKnobStyle(uint32 style)
+{
+	fKnobStyle = style;
+	Invalidate();
+}
+
+
+void
+FakeScrollBar::SetFromScrollBarInfo(const scroll_bar_info &info)
+{
+	fDoubleArrows = info.double_arrows;
+	fKnobStyle = info.knob;
+	Invalidate();
+}
+
+
+//	#pragma mark -
+
+
+void
+FakeScrollBar::_DrawArrowButton(int32 direction, bool doubleArrows, BRect r,
+	const BRect& updateRect)
+{
+	if (!updateRect.Intersects(r))
+		return;
+
+	rgb_color c = ui_color(B_PANEL_BACKGROUND_COLOR);
+	rgb_color light = tint_color(c, B_LIGHTEN_MAX_TINT);
+	rgb_color dark = tint_color(c, B_DARKEN_1_TINT);
+	rgb_color darker = tint_color(c, B_DARKEN_2_TINT);
+	rgb_color normal = c;
+	rgb_color arrow = tint_color(c,
+		(B_DARKEN_MAX_TINT + B_DARKEN_4_TINT) / 2.0);
+
+	BPoint tri1, tri2, tri3;
+	float hInset = r.Width() / 3;
+	float vInset = r.Height() / 3;
+	r.InsetBy(hInset, vInset);
+
+	switch (direction) {
+		case ARROW_LEFT:
+			tri1.Set(r.right, r.top);
+			tri2.Set(r.right - r.Width() / 1.33, (r.top + r.bottom + 1) / 2);
+			tri3.Set(r.right, r.bottom + 1);
+			break;
+
+		case ARROW_RIGHT:
+			tri1.Set(r.left, r.bottom + 1);
+			tri2.Set(r.left + r.Width() / 1.33, (r.top + r.bottom + 1) / 2);
+			tri3.Set(r.left, r.top);
+			break;
+
+		case ARROW_UP:
+			tri1.Set(r.left, r.bottom);
+			tri2.Set((r.left + r.right + 1) / 2, r.bottom - r.Height() / 1.33);
+			tri3.Set(r.right + 1, r.bottom);
+			break;
+
+		default:
+			tri1.Set(r.left, r.top);
+			tri2.Set((r.left + r.right + 1) / 2, r.top + r.Height() / 1.33);
+			tri3.Set(r.right + 1, r.top);
+			break;
+	}
+
+	r.InsetBy(-(hInset - 1), -(vInset - 1));
+	BRect temp(r.InsetByCopy(-1, -1));
+	be_control_look->DrawButtonBackground(this, temp, updateRect,
+		normal, 0, BControlLook::B_ALL_BORDERS, B_HORIZONTAL);
+
+	BShape arrowShape;
+	arrowShape.MoveTo(tri1);
+	arrowShape.LineTo(tri2);
+	arrowShape.LineTo(tri3);
+
+	SetHighColor(arrow);
+	SetPenSize(ceilf(hInset / 2.0));
+	StrokeShape(&arrowShape);
+	SetPenSize(1.0);
+}

src/preferences/appearance/FakeScrollBar.h

@@ -0,0 +1,46 @@
+/*
+ *  Copyright 2010-2012 Haiku, Inc. All rights reserved.
+ *  Distributed under the terms of the MIT license.
+ *
+ *	Authors:
+ *		DarkWyrm <[email protected]>
+ *		John Scipione <[email protected]>
+ */
+#ifndef FAKE_SCROLL_BAR_H
+#define FAKE_SCROLL_BAR_H
+
+
+#include <Control.h>
+
+
+class FakeScrollBar : public BControl {
+public:
+							FakeScrollBar(bool drawArrows, bool doubleArrows,
+								int32 knobStyle, BMessage* message);
+							~FakeScrollBar(void);
+
+	virtual	void			MouseDown(BPoint point);
+	virtual	void			MouseMoved(BPoint point, uint32 transit,
+								const BMessage *message);
+	virtual	void			MouseUp(BPoint point);
+
+	virtual	void			Draw(BRect updateRect);
+
+	virtual	void			SetValue(int32 value);
+
+			void			SetDoubleArrows(bool doublearrows);
+			void			SetKnobStyle(uint32 style);
+
+			void			SetFromScrollBarInfo(const scroll_bar_info &info);
+
+private:
+			void			_DrawArrowButton(int32 direction,
+								bool doubleArrows, BRect r,
+								const BRect& updateRect);
+
+			bool			fDrawArrows;
+			bool			fDoubleArrows;
+			int32			fKnobStyle;
+};
+
+#endif	// FAKE_SCROLL_BAR_H

src/preferences/appearance/Jamfile

@@ -10,6 +10,7 @@ Preference Appearance :
 	APRMain.cpp
 	AntialiasingSettingsView.cpp
 	LookAndFeelSettingsView.cpp
+	FakeScrollBar.cpp
 	FontSelectionView.cpp
 	FontView.cpp
 	APRView.cpp

src/preferences/appearance/LookAndFeelSettingsView.cpp

@@ -3,8 +3,9 @@
  *  Distributed under the terms of the MIT license.
  *
  *	Authors:
- *		Alexander von Gluck, [email protected]
  *		Stephan Aßmus <[email protected]>
+ *		Alexander von Gluck <[email protected]>
+ *		John Scipione <[email protected]>
  *		Ryan Leavengood <[email protected]>
  */
 
@@ -22,15 +23,22 @@
 #include <GridLayoutBuilder.h>
 #include <GroupLayoutBuilder.h>
 #include <InterfaceDefs.h>
+#include <LayoutBuilder.h>
 #include <Locale.h>
 #include <MenuField.h>
 #include <MenuItem.h>
 #include <PopUpMenu.h>
+#include <RadioButton.h>
+#include <ScrollBar.h>
+#include <StringView.h>
+#include <Size.h>
 #include <Slider.h>
 #include <SpaceLayoutItem.h>
+#include <StringView.h>
 #include <TextView.h>
 
 #include "APRWindow.h"
+#include "FakeScrollBar.h"
 
 
 #undef B_TRANSLATION_CONTEXT
@@ -40,9 +48,17 @@
 
 static const int32 kMsgSetDecor = 'deco';
 static const int32 kMsgDecorInfo = 'idec';
-static const int32 kMsgDoubleScrollbarArrows = 'dsba';
 
-static const bool kDefaultDoubleScrollbarArrowsSetting = false;
+static const int32 kMsgDoubleScrollBarArrows = 'dsba';
+
+static const int32 kMsgArrowStyleSingle = 'mass';
+static const int32 kMsgArrowStyleDouble = 'masd';
+
+static const int32 kMsgKnobStyleNone = 'mksn';
+static const int32 kMsgKnobStyleDots = 'mksd';
+static const int32 kMsgKnobStyleLines = 'mksl';
+
+static const bool kDefaultDoubleScrollBarArrowsSetting = false;
 
 
 //	#pragma mark -
@@ -53,8 +69,7 @@ LookAndFeelSettingsView::LookAndFeelSettingsView(const char* name)
 	BView(name, 0),
 	fDecorInfoButton(NULL),
 	fDecorMenuField(NULL),
-	fDecorMenu(NULL),
-	fDoubleScrollbarArrowsCheckBox(NULL)
+	fDecorMenu(NULL)
 {
 	// Decorator menu
 	_BuildDecorMenu();
@@ -64,24 +79,78 @@ LookAndFeelSettingsView::LookAndFeelSettingsView(const char* name)
 	fDecorInfoButton = new BButton(B_TRANSLATE("About"),
 		new BMessage(kMsgDecorInfo));
 
-	fDoubleScrollbarArrowsCheckBox = new BCheckBox("doubleScrollbarArrows",
-		B_TRANSLATE("Use double scrollbar arrows"),
-		new BMessage(kMsgDoubleScrollbarArrows));
+	// scrollbar arrow style
+	BBox* arrowStyleBox = new BBox("arrow style");
+	arrowStyleBox->SetLabel(B_TRANSLATE("Arrow style"));
 
-	fSavedDoubleArrowsValue = _GetDoubleScrollbarArrowsSetting();
-	fDoubleScrollbarArrowsCheckBox->SetValue(fSavedDoubleArrowsValue);
+	fSavedDoubleArrowsValue = _DoubleScrollBarArrows();
+
+	fArrowStyleSingle = new FakeScrollBar(true, false, KNOB_STYLE_LINES,
+		new BMessage(kMsgArrowStyleSingle));
+	fArrowStyleDouble = new FakeScrollBar(true, true, KNOB_STYLE_LINES,
+		new BMessage(kMsgArrowStyleDouble));
+
+	BView* arrowStyleView;
+	arrowStyleView = BLayoutBuilder::Group<>()
+		.AddGroup(B_VERTICAL, 0)
+			.Add(new BStringView("single", B_TRANSLATE("Single:")))
+			.Add(fArrowStyleSingle)
+			.Add(new BStringView("spacer", ""))
+			.Add(new BStringView("double", B_TRANSLATE("Double:")))
+			.Add(fArrowStyleDouble)
+			.SetInsets(B_USE_DEFAULT_SPACING, B_USE_DEFAULT_SPACING,
+				B_USE_DEFAULT_SPACING, B_USE_DEFAULT_SPACING)
+			.End()
+		.View();
+	arrowStyleBox->AddChild(arrowStyleView);
+
+	// scrollbar knob style
+	fSavedKnobStyleValue = _ScrollBarKnobStyle();
+
+	BBox* knobStyleBox = new BBox("knob style");
+	knobStyleBox->SetLabel(B_TRANSLATE("Knob style"));
+
+	fKnobStyleNone = new FakeScrollBar(false, false, KNOB_STYLE_NONE,
+		new BMessage(kMsgKnobStyleNone));
+	fKnobStyleDots = new FakeScrollBar(false, false, KNOB_STYLE_DOTS,
+		new BMessage(kMsgKnobStyleDots));
+	fKnobStyleLines = new FakeScrollBar(false, false, KNOB_STYLE_LINES,
+		new BMessage(kMsgKnobStyleLines));
+
+	BView* knobStyleView;
+	knobStyleView = BLayoutBuilder::Group<>()
+		.AddGroup(B_VERTICAL, 0)
+			.Add(fKnobStyleNone)
+			.Add(new BStringView("spacer", ""))
+			.Add(fKnobStyleDots)
+			.Add(new BStringView("spacer", ""))
+			.Add(fKnobStyleLines)
+			.SetInsets(B_USE_DEFAULT_SPACING, B_USE_DEFAULT_SPACING,
+				B_USE_DEFAULT_SPACING, B_USE_DEFAULT_SPACING)
+			.End()
+		.View();
+	knobStyleBox->AddChild(knobStyleView);
 
 	SetLayout(new BGroupLayout(B_VERTICAL));
 
 	// control layout
-	AddChild(BGridLayoutBuilder(10, 10)
-		.Add(fDecorMenuField->CreateLabelLayoutItem(), 0, 0)
-        .Add(fDecorMenuField->CreateMenuBarLayoutItem(), 1, 0)
-		.Add(fDecorInfoButton, 2, 0)
-
-		.Add(fDoubleScrollbarArrowsCheckBox, 0, 3, 2)
-		.Add(BSpaceLayoutItem::CreateGlue(), 0, 4, 2)
-		.SetInsets(10, 10, 10, 10)
+	AddChild(BGroupLayoutBuilder(B_VERTICAL, B_USE_DEFAULT_SPACING)
+		.AddGroup(B_VERTICAL, B_USE_DEFAULT_SPACING)
+			.Add(BGridLayoutBuilder(B_USE_DEFAULT_SPACING,
+					B_USE_DEFAULT_SPACING)
+				.Add(fDecorMenuField->CreateLabelLayoutItem(), 0, 0)
+		        .Add(fDecorMenuField->CreateMenuBarLayoutItem(), 1, 0)
+				.Add(fDecorInfoButton, 2, 0)
+			)
+			.Add(new BStringView("label", B_TRANSLATE("Scrollbars:")))
+			.AddGroup(B_HORIZONTAL, B_USE_DEFAULT_SPACING)
+				.Add(arrowStyleBox)
+				.Add(knobStyleBox)
+			.End()
+			.AddGlue()
+		.End()
+		.SetInsets(B_USE_DEFAULT_SPACING, B_USE_DEFAULT_SPACING,
+			B_USE_DEFAULT_SPACING, B_USE_DEFAULT_SPACING)
 	);
 	// TODO : Decorator Preview Image?
 }
@@ -102,7 +171,30 @@ LookAndFeelSettingsView::AttachedToWindow()
 
 	fDecorMenu->SetTargetForItems(this);
 	fDecorInfoButton->SetTarget(this);
-	fDoubleScrollbarArrowsCheckBox->SetTarget(this);
+	fArrowStyleSingle->SetTarget(this);
+	fArrowStyleDouble->SetTarget(this);
+	fKnobStyleNone->SetTarget(this);
+	fKnobStyleDots->SetTarget(this);
+	fKnobStyleLines->SetTarget(this);
+
+	if (fSavedDoubleArrowsValue)
+		fArrowStyleDouble->SetValue(B_CONTROL_ON);
+	else
+		fArrowStyleSingle->SetValue(B_CONTROL_ON);
+
+	switch (fSavedKnobStyleValue) {
+		case KNOB_STYLE_NONE:
+			fKnobStyleNone->SetValue(B_CONTROL_ON);
+			break;
+
+		case KNOB_STYLE_DOTS:
+			fKnobStyleDots->SetValue(B_CONTROL_ON);
+			break;
+
+		case KNOB_STYLE_LINES:
+			fKnobStyleLines->SetValue(B_CONTROL_ON);
+			break;
+	}
 }
 
 
@@ -117,6 +209,7 @@ LookAndFeelSettingsView::MessageReceived(BMessage *msg)
 				_SetDecor(newDecor);
 			break;
 		}
+
 		case kMsgDecorInfo:
 		{
 			DecorInfo* decor = fDecorUtility.FindDecorator(fCurrentDecor);
@@ -145,8 +238,25 @@ LookAndFeelSettingsView::MessageReceived(BMessage *msg)
 
 			break;
 		}
-		case kMsgDoubleScrollbarArrows:
-			_SetDoubleScrollbarArrowsSetting(fDoubleScrollbarArrowsCheckBox->Value());
+
+		case kMsgArrowStyleSingle:
+			_SetDoubleScrollBarArrows(false);
+			break;
+
+		case kMsgArrowStyleDouble:
+			_SetDoubleScrollBarArrows(true);
+			break;
+
+		case kMsgKnobStyleNone:
+			_SetScrollBarKnobStyle(KNOB_STYLE_NONE);
+			break;
+
+		case kMsgKnobStyleDots:
+			_SetScrollBarKnobStyle(KNOB_STYLE_DOTS);
+			break;
+
+		case kMsgKnobStyleLines:
+			_SetScrollBarKnobStyle(KNOB_STYLE_LINES);
 			break;
 
 		default:
@@ -221,7 +331,7 @@ LookAndFeelSettingsView::_AdoptInterfaceToCurrentDecor()
 
 
 bool
-LookAndFeelSettingsView::_GetDoubleScrollbarArrowsSetting()
+LookAndFeelSettingsView::_DoubleScrollBarArrows()
 {
 	scroll_bar_info info;
 	get_scroll_bar_info(&info);
@@ -231,42 +341,84 @@ LookAndFeelSettingsView::_GetDoubleScrollbarArrowsSetting()
 
 
 void
-LookAndFeelSettingsView::_SetDoubleScrollbarArrowsSetting(bool value)
+LookAndFeelSettingsView::_SetDoubleScrollBarArrows(bool on)
 {
 	scroll_bar_info info;
 	get_scroll_bar_info(&info);
 
-	info.double_arrows = value;
+	info.double_arrows = on;
 	set_scroll_bar_info(&info);
 
+	if (on)
+		fArrowStyleDouble->SetValue(B_CONTROL_ON);
+	else
+		fArrowStyleSingle->SetValue(B_CONTROL_ON);
+
 	Window()->PostMessage(kMsgUpdate);
 }
 
 
+int32
+LookAndFeelSettingsView::_ScrollBarKnobStyle()
+{
+	scroll_bar_info info;
+	get_scroll_bar_info(&info);
+
+	return info.knob;
+}
+
+
+void
+LookAndFeelSettingsView::_SetScrollBarKnobStyle(int32 knobStyle)
+{
+	scroll_bar_info info;
+	get_scroll_bar_info(&info);
+
+	info.knob = knobStyle;
+	set_scroll_bar_info(&info);
+
+	switch (knobStyle) {
+		case KNOB_STYLE_NONE:
+			fKnobStyleNone->SetValue(B_CONTROL_ON);
+			break;
+
+		case KNOB_STYLE_DOTS:
+			fKnobStyleDots->SetValue(B_CONTROL_ON);
+			break;
+
+		case KNOB_STYLE_LINES:
+			fKnobStyleLines->SetValue(B_CONTROL_ON);
+			break;
+	}
+
+	Window()->PostMessage(kMsgUpdate);
+}
+
+
+bool
+LookAndFeelSettingsView::IsDefaultable()
+{
+	return fCurrentDecor != fDecorUtility.DefaultDecorator()->Name()
+		|| _DoubleScrollBarArrows() != false
+		|| _ScrollBarKnobStyle() != KNOB_STYLE_DOTS;
+}
+
+
 void
 LookAndFeelSettingsView::SetDefaults()
 {
 	_SetDecor(fDecorUtility.DefaultDecorator());
-	_SetDoubleScrollbarArrowsSetting(kDefaultDoubleScrollbarArrowsSetting);
-	fDoubleScrollbarArrowsCheckBox->SetValue(
-		kDefaultDoubleScrollbarArrowsSetting);
-}
-
-
-bool
-LookAndFeelSettingsView::IsDefaultable()
-{
-	return fCurrentDecor != fDecorUtility.DefaultDecorator()->Name() ||
-		fDoubleScrollbarArrowsCheckBox->Value() !=
-			kDefaultDoubleScrollbarArrowsSetting;
+	_SetDoubleScrollBarArrows(false);
+	_SetScrollBarKnobStyle(KNOB_STYLE_DOTS);
 }
 
 
 bool
 LookAndFeelSettingsView::IsRevertable()
 {
-	return fCurrentDecor != fSavedDecor ||
-		fDoubleScrollbarArrowsCheckBox->Value() != fSavedDoubleArrowsValue;
+	return fCurrentDecor != fSavedDecor
+		|| _DoubleScrollBarArrows() != fSavedDoubleArrowsValue
+		|| _ScrollBarKnobStyle() != fSavedKnobStyleValue;
 }
 
 
@@ -274,6 +426,6 @@ void
 LookAndFeelSettingsView::Revert()
 {
 	_SetDecor(fSavedDecor);
-	_SetDoubleScrollbarArrowsSetting(fSavedDoubleArrowsValue);
-	fDoubleScrollbarArrowsCheckBox->SetValue(fSavedDoubleArrowsValue);
+	_SetScrollBarKnobStyle(fSavedKnobStyleValue);
+	_SetDoubleScrollBarArrows(fSavedDoubleArrowsValue);
 }

src/preferences/appearance/LookAndFeelSettingsView.h

@@ -2,9 +2,10 @@
  *  Copyright 2010-2012 Haiku, Inc. All rights reserved.
  *  Distributed under the terms of the MIT license.
  *
- *  Authors:
- *      Alexander von Gluck, [email protected]
+ *	Authors:
  *		Stephan Aßmus <[email protected]>
+ *		Alexander von Gluck <[email protected]>
+ *		John Scipione <[email protected]>
  *		Ryan Leavengood <[email protected]>
  */
 #ifndef LOOK_AND_FEEL_SETTINGS_VIEW_H
@@ -20,7 +21,7 @@ class BButton;
 class BCheckBox;
 class BMenuField;
 class BPopUpMenu;
-
+class FakeScrollBar;
 
 class LookAndFeelSettingsView : public BView {
 public:
@@ -30,10 +31,11 @@ public:
 	virtual	void				AttachedToWindow();
 	virtual	void				MessageReceived(BMessage* message);
 
-			void				SetDefaults();
-			void				Revert();
 			bool				IsDefaultable();
+			void				SetDefaults();
+
 			bool				IsRevertable();
+			void				Revert();
 
 private:
 			void				_SetDecor(const BString& name);
@@ -42,8 +44,12 @@ private:
 			void				_BuildDecorMenu();
 			void				_AdoptToCurrentDecor();
 			void				_AdoptInterfaceToCurrentDecor();
-			bool				_GetDoubleScrollbarArrowsSetting();
-			void				_SetDoubleScrollbarArrowsSetting(bool value);
+
+			bool				_DoubleScrollBarArrows();
+			void				_SetDoubleScrollBarArrows(bool on);
+
+			int32				_ScrollBarKnobStyle();
+			void				_SetScrollBarKnobStyle(int32 knobStyle);
 
 private:
 			DecorInfoUtility	fDecorUtility;
@@ -51,11 +57,19 @@ private:
 			BButton*			fDecorInfoButton;
 			BMenuField*			fDecorMenuField;
 			BPopUpMenu*			fDecorMenu;
-			BCheckBox*			fDoubleScrollbarArrowsCheckBox;
+
+			FakeScrollBar*		fArrowStyleSingle;
+			FakeScrollBar*		fArrowStyleDouble;
+
+			FakeScrollBar*		fKnobStyleNone;
+			FakeScrollBar*		fKnobStyleDots;
+			FakeScrollBar*		fKnobStyleLines;
 
 			BString				fSavedDecor;
 			BString				fCurrentDecor;
+
 			bool				fSavedDoubleArrowsValue;
+			int32				fSavedKnobStyleValue;
 };
 
 #endif // LOOK_AND_FEEL_SETTINGS_VIEW_H