protected ScrollBar(ScrollBarOrientation orientation)
{
this._scrollBarOrientation = orientation;
this._mouseTimer = new Timer();
this._mouseTimer.Tick += new EventHandler(this.MouseTimerTick);
this._mouseTimer.Interval = 100;
this._mouseTimer.Enabled = false;
this._clickAction = ScrollBarHitRegion.None;
this._minimum = 0;
this._maximum = 100;
this._largeChange = 10;
this._smallChange = 1;
this._value = 0;
this._arrowButtonsLayout = ScrollBarArrowButtonsLayout.Edges;
this._leftUpButton = null;
this._leftUpButtonHighlight = null;
this._leftUpButtonDisabled = null;
this._leftUpButtonSize = 0x13;
this._rightDownButton = null;
this._rightDownButtonHighlight = null;
this._rightDownButtonDisabled = null;
this._rightDownButtonSize = 0x13;
this._lowTrack = null;
this._lowTrackHighlight = null;
this._lowTrackDisabled = null;
this._highTrack = null;
this._highTrackHighlight = null;
this._highTrackDisabled = null;
this._trackClickBehavior = ScrollBarTrackClickBehavior.Scroll;
this._thumb = null;
this._thumbHighlight = null;
this._thumbDisabled = null;
this._minimumThumbSize = 11;
this._maximumThumbSize = 0;
this._thumbMargins = new MarginPadding();
this._extension = null;
this._extensionSize = 13;
this._extensionLocation = ScrollBarExtensionLocation.LeftTop;
this._extensionVisible = true;
this._backgroundBufferBitmap = null;
this._backgroundBufferGraphics = null;
this._backgroundValid = BackgroundValid.Invalid;
this._backBufferBitmap = null;
this._backBufferGraphics = null;
this.DrawTrack = null;
this.DrawArrowButton = null;
this.DrawThumb = null;
this.ValueChanged = null;
this.MinimumReached = null;
this.MaximumReached = null;
}
private Graphics GetBackgroundBuffer()
{
Size reqSize = base.Size;
if ((this._extension != null) && this._extensionVisible)
{
if (this._scrollBarOrientation == ScrollBarOrientation.Horizontal)
{
reqSize.Height -= this.ExtensionSize;
}
else
{
reqSize.Width -= this.ExtensionSize;
}
}
if (!CreateBackBuffer(ref this._backgroundBufferGraphics, ref this._backgroundBufferBitmap, reqSize))
{
this._backgroundValid = BackgroundValid.Invalid;
}
return this._backgroundBufferGraphics;
}
private void DoDrawArrowsAndTrack(PaintEventArgs e, Rectangle leftUpArrow, Rectangle rightDownArrow, Rectangle track, Rectangle lowTrack, Rectangle lowTrackVisible, Rectangle highTrack, Rectangle highTrackVisible, Rectangle thumb)
{
PaintEventArgs args = null;
Graphics backgroundBuffer = this.GetBackgroundBuffer();
BackgroundValid valid = this._backgroundValid;
if (backgroundBuffer != null)
{
if (this._backgroundValid != BackgroundValid.Valid)
{
args = new PaintEventArgs(backgroundBuffer, new Rectangle(0, 0, this._backgroundBufferBitmap.Width, this._backgroundBufferBitmap.Height));
if (((this._extension != null) && this._extensionVisible) && (this._extensionLocation == ScrollBarExtensionLocation.LeftTop))
{
int extensionSize = this.ExtensionSize;
if (this._scrollBarOrientation == ScrollBarOrientation.Horizontal)
{
leftUpArrow.Y -= extensionSize;
rightDownArrow.Y -= extensionSize;
track.Y -= extensionSize;
lowTrack.Y -= extensionSize;
lowTrackVisible.Y -= extensionSize;
highTrack.Y -= extensionSize;
highTrackVisible.Y -= extensionSize;
}
else
{
leftUpArrow.X -= extensionSize;
rightDownArrow.X -= extensionSize;
track.X -= extensionSize;
lowTrack.X -= extensionSize;
lowTrackVisible.X -= extensionSize;
highTrack.X -= extensionSize;
highTrackVisible.X -= extensionSize;
}
}
}
}
else
{
args = e;
}
if (valid != BackgroundValid.Valid)
{
if ((((valid & BackgroundValid.LeftUpArrowInvalid) == BackgroundValid.LeftUpArrowInvalid) && (leftUpArrow.Width > 0)) && (leftUpArrow.Height > 0))
{
this.OnDrawArrowButton(new DrawArrowButtonEventArgs(args.Graphics, leftUpArrow, base.Enabled ? ((this._clickAction == ScrollBarHitRegion.LeftUpArrow) ? ScrollBarElementState.Pressed : ScrollBarElementState.Normal) : ScrollBarElementState.Disabled, (this._scrollBarOrientation == ScrollBarOrientation.Horizontal) ? ScrollBarArrow.Left : ScrollBarArrow.Up));
}
if ((((valid & BackgroundValid.RightDownArrowInvalid) == BackgroundValid.RightDownArrowInvalid) && (rightDownArrow.Width > 0)) && (rightDownArrow.Height > 0))
{
this.OnDrawArrowButton(new DrawArrowButtonEventArgs(args.Graphics, rightDownArrow, base.Enabled ? ((this._clickAction == ScrollBarHitRegion.RightDownArrow) ? ScrollBarElementState.Pressed : ScrollBarElementState.Normal) : ScrollBarElementState.Disabled, (this._scrollBarOrientation == ScrollBarOrientation.Horizontal) ? ScrollBarArrow.Right : ScrollBarArrow.Down));
}
if ((valid & BackgroundValid.LowTrackInvalid) == BackgroundValid.LowTrackInvalid)
{
this.OnDrawTrack(new DrawTrackEventArgs(args.Graphics, lowTrack, base.Enabled ? ((this._clickAction == ScrollBarHitRegion.TrackLow) ? ScrollBarElementState.Pressed : ScrollBarElementState.Normal) : ScrollBarElementState.Disabled, lowTrackVisible, track, ScrollBarTrackType.Low));
}
if ((valid & BackgroundValid.HighTrackInvalid) == BackgroundValid.HighTrackInvalid)
{
this.OnDrawTrack(new DrawTrackEventArgs(args.Graphics, highTrack, base.Enabled ? ((this._clickAction == ScrollBarHitRegion.TrackHigh) ? ScrollBarElementState.Pressed : ScrollBarElementState.Normal) : ScrollBarElementState.Disabled, highTrackVisible, track, ScrollBarTrackType.High));
}
this._backgroundValid = (args != e) ? BackgroundValid.Valid : BackgroundValid.Invalid;
}
if (args != e)
{
int x = 0;
int y = 0;
if (((this._extension != null) && this._extensionVisible) && (this._extensionLocation == ScrollBarExtensionLocation.LeftTop))
{
if (this._scrollBarOrientation == ScrollBarOrientation.Horizontal)
{
y += this.ExtensionSize;
}
else if (this._scrollBarOrientation == ScrollBarOrientation.Vertical)
{
x += this.ExtensionSize;
}
}
e.Graphics.DrawImage(this._backgroundBufferBitmap, x, y);
}
}
protected override void OnMouseUp(MouseEventArgs e)
{
this._mouseTimer.Enabled = false;
switch (this._clickAction)
{
case ScrollBarHitRegion.LeftUpArrow:
this._backgroundValid |= BackgroundValid.LeftUpArrowInvalid;
break;
case ScrollBarHitRegion.RightDownArrow:
this._backgroundValid |= BackgroundValid.RightDownArrowInvalid;
break;
case ScrollBarHitRegion.TrackLow:
this._backgroundValid |= BackgroundValid.LowTrackInvalid;
break;
case ScrollBarHitRegion.TrackHigh:
this._backgroundValid |= BackgroundValid.HighTrackInvalid;
break;
case ScrollBarHitRegion.Extension:
if (this._extension != null)
{
this._extension.Mouse(ScrollBarExtensionBase.MouseAction.Up, e);
}
break;
}
this._clickAction = ScrollBarHitRegion.None;
base.OnMouseUp(e);
base.Invalidate();
}
protected override void OnMouseDown(MouseEventArgs e)
{
this._clickAction = this.HitTest(e.X, e.Y, out this._thumbPos);
if (((this._clickAction == ScrollBarHitRegion.TrackLow) || (this._clickAction == ScrollBarHitRegion.TrackHigh)) && (this._trackClickBehavior == ScrollBarTrackClickBehavior.Jump))
{
this._mouseX = base.Left - 1;
this._mouseY = base.Top - 1;
this._clickAction = ScrollBarHitRegion.Thumb;
this.SetValueToMousePosition(e.X, e.Y);
this._backgroundValid |= BackgroundValid.HighTrackInvalid | BackgroundValid.LowTrackInvalid;
this._mouseX = e.X;
this._mouseY = e.Y;
}
else
{
switch (this._clickAction)
{
case ScrollBarHitRegion.LeftUpArrow:
this.Value -= this.SmallChange;
this._mouseTimer.Enabled = true;
this._backgroundValid |= BackgroundValid.LeftUpArrowInvalid;
goto Label_01B7;
case ScrollBarHitRegion.RightDownArrow:
this.Value += this.SmallChange;
this._mouseTimer.Enabled = true;
this._backgroundValid |= BackgroundValid.RightDownArrowInvalid;
goto Label_01B7;
case ScrollBarHitRegion.TrackLow:
this.Value -= this.LargeChange;
this._mouseTimer.Enabled = true;
this._backgroundValid |= BackgroundValid.LowTrackInvalid;
goto Label_01B7;
case ScrollBarHitRegion.TrackHigh:
this.Value += this.LargeChange;
this._mouseTimer.Enabled = true;
this._backgroundValid |= BackgroundValid.HighTrackInvalid;
goto Label_01B7;
case ScrollBarHitRegion.Thumb:
this._mouseX = e.X;
this._mouseY = e.Y;
goto Label_01B7;
case ScrollBarHitRegion.Extension:
if (this._extension != null)
{
this._extension.Mouse(ScrollBarExtensionBase.MouseAction.Down, e);
}
goto Label_01B7;
}
}
Label_01B7:
base.OnMouseDown(e);
base.Invalidate();
}
protected void HandleChange(ScrollBarChangeType type)
{
switch (type)
{
case ScrollBarChangeType.LowTrackPropertyChanged:
this._backgroundValid |= BackgroundValid.LowTrackInvalid;
break;
case ScrollBarChangeType.HighTrackPropertyChanged:
this._backgroundValid |= BackgroundValid.HighTrackInvalid;
break;
case ScrollBarChangeType.NeedFullRedraw:
this._backgroundValid |= BackgroundValid.Invalid;
break;
case ScrollBarChangeType.ScrollBarPropertyChanged:
this._backgroundValid |= BackgroundValid.HighTrackInvalid | BackgroundValid.LowTrackInvalid;
break;
case ScrollBarChangeType.LeftUpArrowPropertyChanged:
this._backgroundValid |= BackgroundValid.LeftUpArrowInvalid;
break;
case ScrollBarChangeType.RightDownArrowPropertyChanged:
this._backgroundValid |= BackgroundValid.RightDownArrowInvalid;
break;
}
base.Invalidate();
}