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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Cairo;
using System.Xml.Serialization;
using System.ComponentModel;
using System.Diagnostics;
namespace go
{
public class Slider : NumericControl
{
#region CTOR
public Slider() : base()
{}
public Slider(double minimum, double maximum, double step)
: base(minimum,maximum,step)
{
}
#endregion
#region implemented abstract members of TemplatedControl
protected override void loadTemplate (GraphicObject template = null)
{
}
#endregion
#region private fields
Rectangle cursor;
int _cursorSize;
Color _cursorColor;
Orientation _orientation;
bool holdCursor = false;
#endregion
protected double unity;
#region Public properties
[XmlAttributeAttribute()][DefaultValue("BlueGray")]
public virtual Color CursorColor {
get { return _cursorColor; }
set {
_cursorColor = value;
registerForGraphicUpdate ();
}
}
[XmlAttributeAttribute()][DefaultValue(20)]
public virtual int CursorSize {
get { return _cursorSize; }
set {
_cursorSize = value;
registerForGraphicUpdate ();
}
}
[XmlAttributeAttribute()][DefaultValue(Orientation.Horizontal)]
public virtual Orientation Orientation
{
get { return _orientation; }
set { _orientation = value; }
}
#endregion
[XmlAttributeAttribute()][DefaultValue(10.0)]
public override double Maximum {
get { return base.Maximum; }
set {
if (value == base.Maximum)
return;
base.Maximum = value;
LargeIncrement = base.Maximum / 10.0;
SmallIncrement = LargeIncrement / 5.0;
}
}
#region GraphicObject Overrides
[XmlAttributeAttribute()][DefaultValue("Gray")]
public override Color Background {
get { return base.Background; }
set { base.Background = value; }
}
[XmlAttributeAttribute()][DefaultValue(true)]
public override bool Focusable
{
get { return base.Focusable; }
set { base.Focusable = value; }
}
//TODO:seems strange to trigger layout computation in an
//overriding of updateGraphic
protected override void UpdateGraphic ()
{
if (Maximum > 0)
computeCursorPosition();
base.UpdateGraphic ();
}
protected override void onDraw (Context gr)
{
base.onDraw (gr);
if (Maximum <= 0)
return;
Rectangle r = ClientRectangle;
PointD pStart;
PointD pEnd;
if (_orientation == Orientation.Horizontal) {
pStart = r.TopLeft + new Point (_cursorSize / 2, r.Height / 2);
pEnd = r.TopRight + new Point (-_cursorSize / 2, r.Height / 2);
} else {
pStart = r.TopLeft + new Point (r.Width / 2, _cursorSize / 2);
pEnd = r.BottomLeft + new Point (r.Width / 2,- _cursorSize / 2);
}
DrawGraduations (gr, pStart,pEnd);
DrawCursor (gr, cursor);
}
#endregion
protected virtual void DrawGraduations(Context gr, PointD pStart, PointD pEnd)
{
gr.Color = Foreground;
gr.LineWidth = 1;
gr.MoveTo(pStart);
gr.LineTo(pEnd);
gr.Stroke();
}
protected virtual void DrawCursor(Context gr, Rectangle _cursor)
{
gr.Color = CursorColor;
CairoHelpers.CairoRectangle (gr, _cursor, CornerRadius);
gr.FillPreserve();
}
void computeCursorPosition()
{
Rectangle r = ClientRectangle;
PointD p1;
if (_orientation == Orientation.Horizontal) {
cursor = new Rectangle (new Size (_cursorSize, (int)(r.Height)));
p1 = r.TopLeft + new Point (_cursorSize / 2, r.Height / 2);
unity = (double)(r.Width - _cursorSize) / (Maximum - Minimum);
cursor.TopLeft = new Point (r.Left + (int)(Value * unity),
(int)(p1.Y - cursor.Height / 2));
} else {
cursor = new Rectangle (new Size ((int)(r.Width), _cursorSize));
p1 = r.TopLeft + new Point (r.Width / 2, _cursorSize / 2);
unity = (double)(r.Height - _cursorSize) / (Maximum - Minimum);
cursor.TopLeft = new Point ((int)(p1.X - r.Width / 2),
r.Top + (int)(Value * unity));
}
}
#region mouse handling
public override void onMouseButtonDown (object sender, OpenTK.Input.MouseButtonEventArgs e)
{
base.onMouseButtonDown (sender, e);
Rectangle cursInScreenCoord = ScreenCoordinates (cursor + Slot.Position);
if (cursInScreenCoord.ContainsOrIsEqual (e.Position))
holdCursor = true;
else if (_orientation == Orientation.Horizontal) {
if (e.Position.X < cursInScreenCoord.Left)
Value -= LargeIncrement;
else
Value += LargeIncrement;
} else {
if (e.Position.Y < cursInScreenCoord.Top)
Value -= LargeIncrement;
else
Value += LargeIncrement;
}
}
public override void onMouseButtonUp (object sender, OpenTK.Input.MouseButtonEventArgs e)
{
base.onMouseButtonUp (sender, e);
holdCursor = false;
}
public override void onMouseMove (object sender, OpenTK.Input.MouseMoveEventArgs e)
{
if (holdCursor) {
if (_orientation == Orientation.Horizontal)
Value += (double)e.XDelta / unity;
else
Value += (double)e.YDelta / unity;
}
base.onMouseMove (sender, e);
}
#endregion
}
}
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