/// <summary>
/// Initializes a new instance of the <see cref="ImageBoxZoomEventArgs"/> class.
/// </summary>
/// <param name="actions">The zoom operation being performed.</param>
/// <param name="source">The source of the operation.</param>
/// <param name="oldZoom">The old zoom level.</param>
/// <param name="newZoom">The new zoom level.</param>
public ImageBoxZoomEventArgs(ImageBoxZoomActions actions, int oldZoom, int newZoom)
: this()
{
this.Actions = actions;
this.OldZoom = oldZoom;
this.NewZoom = newZoom;
}
/// <summary>
/// Initializes a new instance of the <see cref="ImageBoxZoomEventArgs"/> class.
/// </summary>
/// <param name="actions">The zoom operation being performed.</param>
/// <param name="source">The source of the operation.</param>
/// <param name="oldZoom">The old zoom level.</param>
/// <param name="newZoom">The new zoom level.</param>
public ImageBoxZoomEventArgs(ImageBoxZoomActions actions, ImageBoxActionSources source, int oldZoom, int newZoom)
: this()
{
Actions = actions;
Source = source;
OldZoom = oldZoom;
NewZoom = newZoom;
}
/// <summary>
/// Initializes a new instance of the <see cref="ImageBoxExtendedZoomEventArgs"/> class.
/// </summary>
/// <param name="actions">The zoom operation being performed.</param>
/// <param name="source">The source of the operation.</param>
/// <param name="oldZoom">The old zoom level.</param>
/// <param name="newZoom">The new zoom level.</param>
public ImageBoxExtendedZoomEventArgs(ImageBoxZoomActions actions, ImageBoxActionSources source, int oldZoom, int newZoom)
: this()
{
this.Actions = actions;
this.Source = source;
this.OldZoom = oldZoom;
this.NewZoom = newZoom;
}
/// <summary>
/// Initializes a new instance of the <see cref="ImageBoxZoomEventArgs"/> class.
/// </summary>
/// <param name="actions">The zoom operation being performed.</param>
/// <param name="source">The source of the operation.</param>
/// <param name="oldZoom">The old zoom level.</param>
/// <param name="newZoom">The new zoom level.</param>
public ImageBoxZoomEventArgs(ImageBoxZoomActions actions, ImageBoxActionSources source, int oldZoom, int newZoom)
: this()
{
this.Actions = actions;
this.Source = source;
this.OldZoom = oldZoom;
this.NewZoom = newZoom;
}
/// <summary>
/// Updates the current zoom.
/// </summary>
/// <param name="value">The new zoom value.</param>
/// <param name="actions">The zoom actions that caused the value to be updated.</param>
private void SetZoom(double value, ImageBoxZoomActions actions)
{
double previousZoom;
previousZoom = this.FullScaleZoom;
if (value < MinZoom)
{
value = MinZoom;
}
else if (value > MaxZoom)
{
value = MaxZoom;
}
if (_fszoom != value)
{
_fszoom = value;
}
}
/// <summary>
/// Updates the current zoom.
/// </summary>
/// <param name="value">The new zoom value.</param>
/// <param name="actions">The zoom actions that caused the value to be updated.</param>
/// <param name="source">The source of the zoom operation.</param>
private void SetZoom(int value, ImageBoxZoomActions actions, ImageBoxActionSources source)
{
int previousZoom;
previousZoom = this.Zoom;
if (value < MinZoom)
{
value = MinZoom;
}
else if (value > MaxZoom)
{
value = MaxZoom;
}
if (_zoom != value)
{
_zoom = value;
this.OnZoomChanged(EventArgs.Empty);
this.OnZoomed(new ImageBoxZoomEventArgs(actions, source, previousZoom, this.Zoom));
}
}
/// <summary>
/// Returns an appropriate zoom level based on the specified action, relative to the current zoom level.
/// </summary>
/// <param name="action">The action to determine the zoom level.</param>
/// <exception cref="System.ArgumentOutOfRangeException">Thrown if an unsupported action is specified.</exception>
private int GetZoomLevel(ImageBoxZoomActions action)
{
int result;
switch (action)
{
case ImageBoxZoomActions.None:
result = this.Zoom;
break;
case ImageBoxZoomActions.ZoomIn:
result = this.ZoomLevels.NextZoom(this.Zoom);
break;
case ImageBoxZoomActions.ZoomOut:
result = this.ZoomLevels.PreviousZoom(this.Zoom);
break;
case ImageBoxZoomActions.ActualSize:
result = 100;
break;
default:
throw new ArgumentOutOfRangeException("action");
}
return result;
}
/// <summary>
/// Performs a zoom action.
/// </summary>
/// <param name="action">The action to perform.</param>
/// <param name="source">The source that initiated the action.</param>
/// <param name="preservePosition"><c>true</c> if the current scrolling position should be preserved relative to the new zoom level, <c>false</c> to reset.</param>
/// <param name="relativePoint">A <see cref="Point"/> describing the current center of the control.</param>
private void PerformZoom(ImageBoxZoomActions action, ImageBoxActionSources source, bool preservePosition, Point relativePoint)
{
Point currentPixel;
int currentZoom;
int newZoom;
currentPixel = this.PointToImage(relativePoint);
currentZoom = this.Zoom;
newZoom = this.GetZoomLevel(action);
this.RestoreSizeMode();
this.SetZoom(newZoom, action, source);
if (preservePosition && this.Zoom != currentZoom)
{
this.ScrollTo(currentPixel, relativePoint);
}
}
/// <summary>
/// Performs a zoom action.
/// </summary>
/// <param name="action">The action to perform.</param>
/// <param name="source">The source that initiated the action.</param>
/// <param name="preservePosition"><c>true</c> if the current scrolling position should be preserved relative to the new zoom level, <c>false</c> to reset.</param>
private void PerformZoom(ImageBoxZoomActions action, ImageBoxActionSources source, bool preservePosition)
{
this.PerformZoom(action, source, preservePosition, this.CenterPoint);
}
