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|
//
// System.Windows.Forms.ScrollBar.cs
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
// Copyright (C) 2004, Novell, Inc.
//
// Authors:
// Jordi Mas i Hernandez jordi@ximian.com
//
//
// COMPLETE
using System.Drawing;
using System.Drawing.Imaging;
using System.Drawing.Drawing2D;
using System.ComponentModel;
using System.Runtime.InteropServices;
namespace System.Windows.Forms
{
[DefaultEvent ("Scroll")]
[DefaultProperty ("Value")]
public class ScrollBar : Control
{
#region Local Variables
private int position;
private int minimum;
private int maximum;
private int large_change;
private int small_change;
internal int scrollbutton_height;
internal int scrollbutton_width;
private ScrollBars type;
private Rectangle first_arrow_area = new Rectangle (); // up or left
private Rectangle second_arrow_area = new Rectangle (); // down or right
private Rectangle thumb_pos = new Rectangle ();
private Rectangle thumb_area = new Rectangle ();
internal ButtonState firstbutton_state = ButtonState.Normal;
internal ButtonState secondbutton_state = ButtonState.Normal;
private bool firstbutton_pressed = false;
private bool secondbutton_pressed = false;
private bool thumb_pressed = false;
private float pixel_per_pos = 0;
private Timer timer = new Timer ();
private TimerType timer_type;
private int thumb_pixel_click_move;
private int thumb_pixel_click_move_prev;
private int thumb_size = 40;
private const int thumb_min_size = 8;
private const int thumb_notshown_size = 40;
internal bool vert;
private int lastclick_pos; // Position of the last button-down event
private int lastclick_pos_thumb; // Position of the last button-down event relative to the thumb
private bool outside_thumbarea_right = false;
private bool outside_thumbarea_left = false;
internal ThumbMoving thumb_moving = ThumbMoving.None;
#endregion // Local Variables
private enum TimerType
{
HoldButton,
RepeatButton,
HoldThumbArea,
RepeatThumbArea
}
internal enum ThumbMoving
{
None,
Forward,
Backwards,
}
#region Events
public new event EventHandler BackColorChanged;
public new event EventHandler BackgroundImageChanged;
public new event EventHandler Click;
public new event EventHandler DoubleClick;
public new event EventHandler FontChanged;
public new event EventHandler ForeColorChanged;
public new event EventHandler ImeModeChanged;
public new event MouseEventHandler MouseDown;
public new event MouseEventHandler MouseMove;
public new event MouseEventHandler MouseUp;
public new event PaintEventHandler Paint;
public event ScrollEventHandler Scroll;
public new event EventHandler TextChanged;
public event EventHandler ValueChanged;
#endregion Events
public ScrollBar ()
{
position = 0;
minimum = 0;
maximum = 100;
large_change = 10;
small_change = 1;
timer.Tick += new EventHandler (OnTimer);
base.KeyDown += new KeyEventHandler (OnKeyDownSB);
base.MouseDown += new MouseEventHandler (OnMouseDownSB);
base.MouseUp += new MouseEventHandler (OnMouseUpSB);
base.MouseMove += new MouseEventHandler (OnMouseMoveSB);
base.Resize += new EventHandler (OnResizeSB);
base.TabStop = false;
if (ThemeEngine.Current.DoubleBufferingSupported == true) {
double_buffering = true;
} else {
double_buffering = false;
}
SetStyle (ControlStyles.UserPaint | ControlStyles.AllPaintingInWmPaint, true);
SetStyle (ControlStyles.ResizeRedraw | ControlStyles.Opaque, true);
}
#region Internal & Private Properties
internal Rectangle FirstArrowArea {
get {
return this.first_arrow_area;
}
set {
this.first_arrow_area = value;
}
}
internal Rectangle SecondArrowArea {
get {
return this.second_arrow_area;
}
set {
this.second_arrow_area = value;
}
}
internal Rectangle ThumbPos {
get {
return thumb_pos;
}
set {
thumb_pos = value;
}
}
#endregion // Internal & Private Properties
#region Public Properties
[EditorBrowsable (EditorBrowsableState.Never)]
public override Color BackColor
{
get { return base.BackColor; }
set {
if (base.BackColor == value)
return;
if (BackColorChanged != null)
BackColorChanged (this, EventArgs.Empty);
base.BackColor = value;
Refresh ();
}
}
[EditorBrowsable (EditorBrowsableState.Never)]
public override Image BackgroundImage
{
get { return base.BackgroundImage; }
set {
if (base.BackgroundImage == value)
return;
if (BackgroundImageChanged != null)
BackgroundImageChanged (this, EventArgs.Empty);
base.BackgroundImage = value;
}
}
protected override CreateParams CreateParams
{
get { return base.CreateParams; }
}
protected override ImeMode DefaultImeMode
{
get { return ImeMode.Disable; }
}
public override Font Font
{
get { return base.Font; }
set {
if (base.Font == value)
return;
if (FontChanged != null)
FontChanged (this, EventArgs.Empty);
base.Font = value;
}
}
[EditorBrowsable (EditorBrowsableState.Never)]
public override Color ForeColor
{
get { return base.ForeColor; }
set {
if (base.ForeColor == value)
return;
if (ForeColorChanged != null)
ForeColorChanged (this, EventArgs.Empty);
base.ForeColor = value;
Refresh ();
}
}
[EditorBrowsable (EditorBrowsableState.Never)]
public new ImeMode ImeMode
{
get { return base.ImeMode; }
set {
if (base.ImeMode == value)
return;
if (ImeModeChanged != null)
ImeModeChanged (this, EventArgs.Empty);
base.ImeMode = value;
}
}
public int LargeChange {
get {
if (large_change > maximum)
return (maximum + 1);
else
return large_change;
}
set {
if (value < 0)
throw new Exception( string.Format("Value '{0}' must be greater than or equal to 0.", value));
if (large_change != value) {
large_change = value;
// thumb area depends on large change value,
// so we need to recalculate it.
CalcThumbArea ();
UpdatePos (Value, true);
Refresh ();
}
}
}
public int Maximum {
get { return maximum; }
set {
maximum = value;
if (maximum < minimum)
minimum = maximum;
// thumb area depends on maximum value,
// so we need to recalculate it.
CalcThumbArea ();
UpdatePos (Value, true);
Refresh ();
}
}
public int Minimum {
get { return minimum; }
set {
minimum = value;
if (minimum > maximum)
maximum = minimum;
// thumb area depends on minimum value,
// so we need to recalculate it.
CalcThumbArea ();
UpdatePos (Value, true);
Refresh ();
}
}
public int SmallChange {
get { return small_change; }
set {
if ( value < 0 )
throw new Exception( string.Format("Value '{0}' must be greater than or equal to 0.", value));
if (small_change != value) {
small_change = value;
UpdatePos (Value, true);
Refresh ();
}
}
}
public new bool TabStop {
get { return base.TabStop; }
set { base.TabStop = value; }
}
[EditorBrowsable (EditorBrowsableState.Never)]
public override string Text {
get { return base.Text; }
set { base.Text = value; }
}
public int Value {
get { return position; }
set {
if ( value < minimum || value > maximum )
throw new ArgumentException(
string.Format("'{0}' is not a valid value for 'Value'. 'Value' should be between 'Minimum' and 'Maximum'", value));
if (position != value){
position = value;
if (ValueChanged != null)
ValueChanged (this, EventArgs.Empty);
UpdatePos (Value, true);
Refresh ();
}
}
}
#endregion //Public Properties
#region Public Methods
protected override void OnEnabledChanged (EventArgs e)
{
base.OnEnabledChanged (e);
if (Enabled)
firstbutton_state = secondbutton_state = ButtonState.Normal;
else
firstbutton_state = secondbutton_state = ButtonState.Inactive;
Refresh ();
}
protected override void OnHandleCreated (System.EventArgs e)
{
base.OnHandleCreated (e);
CalcThumbArea ();
UpdatePos (Value, true);
}
protected virtual void OnScroll (ScrollEventArgs event_args)
{
if (Scroll == null)
return;
Scroll (this, event_args);
}
protected virtual void OnValueChanged (EventArgs e)
{
if (ValueChanged != null)
ValueChanged (this, e);
}
public override string ToString()
{
return string.Format("{0}, Minimum: {1}, Maximum: {2}, Value: {3}",
GetType( ).FullName.ToString( ), minimum, maximum, position);
}
protected void UpdateScrollInfo ()
{
Refresh ();
}
protected override void WndProc (ref Message m)
{
switch ((Msg) m.Msg)
{
case Msg.WM_PAINT:
{
PaintEventArgs paint_event;
paint_event = XplatUI.PaintEventStart (Handle);
OnPaintSB (paint_event);
XplatUI.PaintEventEnd (Handle);
return;
}
case Msg.WM_ERASEBKGND:
m.Result = (IntPtr) 1; /// Disable background painting to avoid flickering
return;
default:
break;
}
base.WndProc (ref m);
}
#endregion //Public Methods
#region Private Methods
private void CalcThumbArea ()
{
// Thumb area
if (vert) {
thumb_area.Height = Height - scrollbutton_height - scrollbutton_height;
thumb_area.X = 0;
thumb_area.Y = scrollbutton_height;
thumb_area.Width = Width;
if (Height < thumb_notshown_size)
thumb_size = 0;
else {
double per = ((double) this.LargeChange / (double)((1 + maximum - minimum)));
thumb_size = 1 + (int) (thumb_area.Height * per);
if (thumb_size < thumb_min_size)
thumb_size = thumb_min_size;
}
pixel_per_pos = ((float)(thumb_area.Height - thumb_size) / (float) ((maximum - minimum - this.LargeChange) + 1));
} else {
thumb_area.Y = 0;
thumb_area.X = scrollbutton_width;
thumb_area.Height = Height;
thumb_area.Width = Width - scrollbutton_width - scrollbutton_width;
if (Width < thumb_notshown_size)
thumb_size = 0;
else {
double per = ((double) this.LargeChange / (double)((1 + maximum - minimum)));
thumb_size = 1 + (int) (thumb_area.Width * per);
if (thumb_size < thumb_min_size)
thumb_size = thumb_min_size;
}
pixel_per_pos = ((float)(thumb_area.Width - thumb_size) / (float) ((maximum - minimum - this.LargeChange) + 1));
}
}
private void Draw ()
{
ThemeEngine.Current.DrawScrollBar(DeviceContext, this.ClientRectangle, this);
}
private void LargeIncrement ()
{
UpdatePos (position + large_change, true);
Refresh ();
OnScroll (new ScrollEventArgs (ScrollEventType.LargeIncrement, position));
OnScroll (new ScrollEventArgs (ScrollEventType.EndScroll, position));
}
private void LargeDecrement ()
{
UpdatePos (position - large_change, true);
Refresh ();
OnScroll (new ScrollEventArgs (ScrollEventType.LargeDecrement, position));
OnScroll (new ScrollEventArgs (ScrollEventType.EndScroll, position));
}
private void OnResizeSB (Object o, EventArgs e)
{
if (Width <= 0 || Height <= 0)
return;
if (vert) {
if (Height < ThemeEngine.Current.ScrollBarButtonSize * 2)
scrollbutton_height = Height /2;
else
scrollbutton_height = ThemeEngine.Current.ScrollBarButtonSize;
} else {
if (Width < ThemeEngine.Current.ScrollBarButtonSize * 2)
scrollbutton_width = Width /2;
else
scrollbutton_width = ThemeEngine.Current.ScrollBarButtonSize;
}
CalcThumbArea ();
UpdatePos (position, true);
}
private void OnPaintSB (PaintEventArgs pevent)
{
if (Width <= 0 || Height <= 0 || Visible == false)
return;
/* Copies memory drawing buffer to screen*/
Draw ();
if (double_buffering)
pevent.Graphics.DrawImage (ImageBuffer, 0, 0);
}
private void OnTimer (Object source, EventArgs e)
{
switch (timer_type) {
case TimerType.HoldButton:
SetRepeatButtonTimer ();
break;
case TimerType.RepeatButton:
{
if ((firstbutton_state & ButtonState.Pushed) == ButtonState.Pushed)
SmallDecrement();
if ((secondbutton_state & ButtonState.Pushed) == ButtonState.Pushed)
SmallIncrement();
break;
}
case TimerType.HoldThumbArea:
SetRepeatThumbAreaTimer ();
break;
case TimerType.RepeatThumbArea:
{
Point pnt;
pnt = PointToClient (MousePosition);
if (vert)
lastclick_pos = pnt.Y;
else
lastclick_pos = pnt.X;
if (thumb_moving == ThumbMoving.Forward) {
if ((vert && (thumb_pos.Y + thumb_size > lastclick_pos)) ||
(!vert && (thumb_pos.X + thumb_size > lastclick_pos)) ||
(thumb_area.Contains (pnt) == false)){
timer.Enabled = false;
thumb_moving = ThumbMoving.None;
Refresh ();
} else
LargeIncrement ();
}
else
if ((vert && (thumb_pos.Y < lastclick_pos)) ||
(!vert && (thumb_pos.X < lastclick_pos))){
timer.Enabled = false;
thumb_moving = ThumbMoving.None;
Refresh ();
} else
LargeDecrement ();
break;
}
default:
break;
}
}
private void OnMouseMoveSB (object sender, MouseEventArgs e)
{
if (Enabled == false || thumb_size == 0)
return;
if (firstbutton_pressed) {
if (!first_arrow_area.Contains (e.X, e.Y) && ((firstbutton_state & ButtonState.Pushed) == ButtonState.Pushed)) {
firstbutton_state = ButtonState.Normal;
Refresh ();
return;
} else if (first_arrow_area.Contains (e.X, e.Y) && ((firstbutton_state & ButtonState.Normal) == ButtonState.Normal)) {
firstbutton_state = ButtonState.Pushed;
Refresh ();
return;
}
} else if (secondbutton_pressed) {
if (!second_arrow_area.Contains (e.X, e.Y) && ((secondbutton_state & ButtonState.Pushed) == ButtonState.Pushed)) {
secondbutton_state = ButtonState.Normal;
Refresh ();
return;
} else if (second_arrow_area.Contains (e.X, e.Y) && ((secondbutton_state & ButtonState.Normal) == ButtonState.Normal)) {
secondbutton_state = ButtonState.Pushed;
Refresh ();
return;
}
} else if (thumb_pressed == true) {
int pixel_pos;
if (vert) {
int mouse_click = e.Y;
int outside_curpos = thumb_area.Y + thumb_area.Height - thumb_size + lastclick_pos_thumb;
if (mouse_click > thumb_area.Y + thumb_area.Height) {
outside_thumbarea_right = true;
mouse_click = thumb_area.Y + thumb_area.Height;
}
if (mouse_click < thumb_area.Y) {
outside_thumbarea_left = true;
mouse_click = thumb_area.Y;
}
if (outside_thumbarea_right && mouse_click < outside_curpos) {
outside_thumbarea_right = false;
thumb_pixel_click_move_prev =
thumb_pixel_click_move = outside_curpos;
}
if (outside_thumbarea_left && mouse_click > thumb_area.Y + lastclick_pos_thumb) {
outside_thumbarea_left = false;
thumb_pixel_click_move_prev =
thumb_pixel_click_move = thumb_area.Y + lastclick_pos_thumb;
}
if (outside_thumbarea_right == false && outside_thumbarea_left == false) {
pixel_pos = thumb_pos.Y + (thumb_pixel_click_move - thumb_pixel_click_move_prev);
thumb_pixel_click_move_prev = thumb_pixel_click_move;
thumb_pixel_click_move = mouse_click;
UpdateThumbPos (pixel_pos, true);
}
}
else {
int mouse_click = e.X;
int outside_curpos = thumb_area.X + thumb_area.Width - thumb_size + lastclick_pos_thumb;
if (mouse_click > thumb_area.X + thumb_area.Width) {
outside_thumbarea_right = true;
mouse_click = thumb_area.X + thumb_area.Width;
}
if (mouse_click < thumb_area.X) {
outside_thumbarea_left = true;
mouse_click = thumb_area.X;
}
if (outside_thumbarea_right && mouse_click < outside_curpos) {
outside_thumbarea_right = false;
thumb_pixel_click_move_prev =
thumb_pixel_click_move = outside_curpos;
}
if (outside_thumbarea_left && mouse_click > thumb_area.X + lastclick_pos_thumb) {
outside_thumbarea_left = false;
thumb_pixel_click_move_prev =
thumb_pixel_click_move = thumb_area.X + lastclick_pos_thumb;
}
if (outside_thumbarea_right == false && outside_thumbarea_left == false) {
pixel_pos = thumb_pos.X + (thumb_pixel_click_move - thumb_pixel_click_move_prev);
thumb_pixel_click_move_prev = thumb_pixel_click_move;
thumb_pixel_click_move = mouse_click;
UpdateThumbPos (pixel_pos, true);
}
}
Refresh ();
}
}
private void OnMouseDownSB (object sender, MouseEventArgs e)
{
if (Enabled == false)
return;
if (firstbutton_state != ButtonState.Inactive && first_arrow_area.Contains (e.X, e.Y)) {
this.Capture = true;
firstbutton_state = ButtonState.Pushed;
firstbutton_pressed = true;
Refresh ();
}
if (secondbutton_state != ButtonState.Inactive && second_arrow_area.Contains (e.X, e.Y)) {
this.Capture = true;
secondbutton_state = ButtonState.Pushed;
secondbutton_pressed = true;
Refresh ();
}
if (thumb_size > 0 && thumb_pos.Contains (e.X, e.Y)) {
thumb_pressed = true;
this.Capture = true;
Refresh ();
if (vert) {
lastclick_pos_thumb = e.Y - thumb_pos.Y;
lastclick_pos = e.Y;
thumb_pixel_click_move_prev = thumb_pixel_click_move = e.Y;
}
else {
lastclick_pos_thumb = e.X - thumb_pos.X;
lastclick_pos = e.X;
thumb_pixel_click_move_prev = thumb_pixel_click_move = e.X;
}
}
else {
if (thumb_size > 0 && thumb_area.Contains (e.X, e.Y)) {
if (vert) {
lastclick_pos_thumb = e.Y - thumb_pos.Y;
lastclick_pos = e.Y;
if (e.Y > thumb_pos.Y + thumb_pos.Height) {
LargeIncrement ();
thumb_moving = ThumbMoving.Forward;
}
else {
LargeDecrement ();
thumb_moving = ThumbMoving.Backwards;
}
}
else {
lastclick_pos_thumb = e.X - thumb_pos.X;
lastclick_pos = e.X;
if (e.X > thumb_pos.X + thumb_pos.Width) {
thumb_moving = ThumbMoving.Forward;
LargeIncrement ();
}
else {
thumb_moving = ThumbMoving.Backwards;
LargeDecrement ();
}
}
SetHoldThumbAreaTimer ();
timer.Enabled = true;
Refresh ();
}
}
/* If arrows are pressed, fire timer for auto-repeat */
if ((((firstbutton_state & ButtonState.Pushed) == ButtonState.Pushed)
|| ((secondbutton_state & ButtonState.Pushed) == ButtonState.Pushed)) &&
timer.Enabled == false) {
SetHoldButtonClickTimer ();
timer.Enabled = true;
}
}
private void OnMouseUpSB (object sender, MouseEventArgs e)
{
if (Enabled == false)
return;
timer.Enabled = false;
if (thumb_moving != ThumbMoving.None) {
thumb_moving = ThumbMoving.None;
Refresh ();
}
this.Capture = false;
if (firstbutton_pressed) {
firstbutton_state = ButtonState.Normal;
if (first_arrow_area.Contains (e.X, e.Y)) {
SmallDecrement ();
}
firstbutton_pressed = false;
return;
} else if (secondbutton_pressed) {
secondbutton_state = ButtonState.Normal;
if (second_arrow_area.Contains (e.X, e.Y)) {
SmallIncrement ();
}
secondbutton_pressed = false;
return;
} else if (thumb_pressed == true) {
OnScroll (new ScrollEventArgs (ScrollEventType.ThumbPosition, position));
OnScroll (new ScrollEventArgs (ScrollEventType.EndScroll, position));
thumb_pressed = false;
Refresh ();
}
}
private void OnKeyDownSB (Object o, KeyEventArgs key)
{
if (Enabled == false)
return;
switch (key.KeyCode){
case Keys.Up:
{
SmallDecrement ();
break;
}
case Keys.Down:
{
SmallIncrement ();
break;
}
case Keys.PageUp:
{
LargeDecrement ();
break;
}
case Keys.PageDown:
{
LargeIncrement ();
break;
}
default:
break;
}
}
private void SmallIncrement ()
{
UpdatePos (position + small_change, true);
Refresh ();
OnScroll (new ScrollEventArgs (ScrollEventType.SmallIncrement, position));
OnScroll (new ScrollEventArgs (ScrollEventType.EndScroll, position));
}
private void SmallDecrement ()
{
UpdatePos (position - small_change, true);
Refresh ();
OnScroll (new ScrollEventArgs (ScrollEventType.SmallDecrement, position));
OnScroll (new ScrollEventArgs (ScrollEventType.EndScroll, position));
}
private void SetHoldButtonClickTimer ()
{
timer.Enabled = false;
timer.Interval = 200;
timer_type = TimerType.HoldButton;
timer.Enabled = true;
}
private void SetRepeatButtonTimer ()
{
timer.Enabled = false;
timer.Interval = 50;
timer_type = TimerType.RepeatButton;
timer.Enabled = true;
}
private void SetHoldThumbAreaTimer ()
{
timer.Enabled = false;
timer.Interval = 200;
timer_type = TimerType.HoldThumbArea;
timer.Enabled = true;
}
private void SetRepeatThumbAreaTimer ()
{
timer.Enabled = false;
timer.Interval = 50;
timer_type = TimerType.RepeatThumbArea;
timer.Enabled = true;
}
private void UpdatePos (int newPos, bool update_thumbpos)
{
int old = position;
int pos;
if (newPos < minimum)
pos = minimum;
else
if (newPos > maximum + 1 - large_change)
pos = maximum + 1 - large_change;
else
pos = newPos;
// pos can't be less than minimum
if (pos < minimum)
pos = minimum;
if (update_thumbpos) {
if (vert)
UpdateThumbPos (thumb_area.Y + (int)(((float)(pos - minimum)) * pixel_per_pos), false);
else
UpdateThumbPos (thumb_area.X + (int)(((float)(pos - minimum)) * pixel_per_pos), false);
Value = pos;
}
else {
position = pos; // Updates directly the value to avoid thumb pos update
if (ValueChanged != null)
ValueChanged (this, EventArgs.Empty);
}
if (pos != old) // Fire event
OnScroll (new ScrollEventArgs (ScrollEventType.ThumbTrack, pos));
}
private void UpdateThumbPos (int pixel, bool update_value)
{
float new_pos = 0;
if (vert) {
if (pixel < thumb_area.Y)
thumb_pos.Y = thumb_area.Y;
else
if (pixel > thumb_area.Y + thumb_area.Height - thumb_size)
thumb_pos.Y = thumb_area.Y + thumb_area.Height - thumb_size;
else
thumb_pos.Y = pixel;
thumb_pos.X = 0;
thumb_pos.Width = ThemeEngine.Current.ScrollBarButtonSize;
thumb_pos.Height = thumb_size;
new_pos = (float) (thumb_pos.Y - thumb_area.Y);
new_pos = new_pos / pixel_per_pos;
} else {
if (pixel < thumb_area.X)
thumb_pos.X = thumb_area.X;
else
if (pixel > thumb_area.X + thumb_area.Width - thumb_size)
thumb_pos.X = thumb_area.X + thumb_area.Width - thumb_size;
else
thumb_pos.X = pixel;
thumb_pos.Y = 0;
thumb_pos.Width = thumb_size;
thumb_pos.Height = ThemeEngine.Current.ScrollBarButtonSize;
new_pos = (float) (thumb_pos.X - thumb_area.X);
new_pos = new_pos / pixel_per_pos;
}
if (update_value)
UpdatePos ((int) new_pos + minimum, false);
}
#endregion //Private Methods
}
}
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