public void ScrollToMakeVisible(RectangleD rect)
{
RectangleD visible = VisibleArea;
if (visible.Contains(rect))
{
return;
}
Hadjustment.Lower = Math.Min(Hadjustment.Lower, rect.X);
Hadjustment.Upper = Math.Max(Hadjustment.Upper, rect.X2);
Hadjustment.Change();
Vadjustment.Lower = Math.Min(Vadjustment.Lower, rect.Y);
Vadjustment.Upper = Math.Max(Vadjustment.Upper, rect.Y2);
Vadjustment.Change();
if (rect.X < visible.X)
{
Hadjustment.Value = Math.Round(rect.X, 0);
}
if (rect.X2 > visible.X2)
{
Hadjustment.Value = Math.Round(rect.X2 - visible.Width, 0);
}
if (rect.Y < visible.Y)
{
Vadjustment.Value = Math.Round(rect.Y, 0);
}
if (rect.Y2 > visible.Y2)
{
Vadjustment.Value = Math.Round(rect.Y2 - visible.Height, 0);
}
}
public void ScrollToMakeVisible(PointD point)
{
RectangleD visible = VisibleArea;
if (visible.Contains(point.X, point.Y))
{
return;
}
Hadjustment.Lower = Math.Min(Hadjustment.Lower, point.X);
Hadjustment.Upper = Math.Max(Hadjustment.Upper, point.X);
Hadjustment.Change();
Vadjustment.Lower = Math.Min(Vadjustment.Lower, point.Y);
Vadjustment.Upper = Math.Max(Vadjustment.Upper, point.Y);
Vadjustment.Change();
if (point.X < visible.X)
{
Hadjustment.Value = Math.Round(point.X, 0);
}
else if (point.X > visible.X2)
{
Hadjustment.Value = Math.Round(point.X - visible.Width, 0);
}
if (point.Y < visible.Y)
{
Vadjustment.Value = Math.Round(point.Y, 0);
}
else if (point.Y > visible.Y2)
{
Vadjustment.Value = Math.Round(point.Y - visible.Height, 0);
}
}
public void ScrollCanvas(int dx, int dy)
{
double hadjustment = Hadjustment.Value + dx;
double vadjustment = Vadjustment.Value + dy;
Hadjustment.Lower = Math.Min(Hadjustment.Lower, hadjustment);
Hadjustment.Upper = Math.Max(Hadjustment.Upper, hadjustment);
Hadjustment.Change();
Vadjustment.Lower = Math.Min(Vadjustment.Lower, vadjustment);
Vadjustment.Upper = Math.Max(Vadjustment.Upper, vadjustment);
Vadjustment.Change();
Hadjustment.Value = hadjustment;
Vadjustment.Value = vadjustment;
}
protected override void UpdateLayout()
{
System.Console.WriteLine("in update layout {0}", Allocation.ToString());
int num_thumbnails;
if (collection != null)
{
num_thumbnails = collection.Count;
}
else
{
num_thumbnails = 0;
}
cells_per_row = System.Math.Max(num_thumbnails, 1);
int num_rows = 1;
int num_cols = num_thumbnails;
int available_height = Allocation.Height - 2 * BORDER_SIZE;
if (DisplayTags)
{
available_height -= tag_icon_size + tag_icon_vspacing;
}
if (DisplayDates && this.Style != null)
{
Pango.FontMetrics metrics = this.PangoContext.GetMetrics(this.Style.FontDescription,
Pango.Language.FromString("en_US"));
available_height -= PangoPixels(metrics.Ascent + metrics.Descent);
}
thumbnail_width = (int)(available_height / thumbnail_ratio);
cell_width = ThumbnailWidth + 2 * cell_border_width;
cell_height = ThumbnailHeight + 2 * cell_border_width;
SetSize(System.Math.Max(((uint)(num_cols * cell_width + 2 * BORDER_SIZE)), (uint)Allocation.Width), (uint)(num_rows * cell_height + 2 * BORDER_SIZE));
Vadjustment.StepIncrement = cell_height;
Vadjustment.Change();
Hadjustment.StepIncrement = cell_width;
Hadjustment.Change();
}
protected override void OnMouseScrolled(MouseScrolledEventArgs args)
{
var alloc = Bounds;
if ((args.Direction == ScrollDirection.Left ||
args.Direction == ScrollDirection.Right) &&
hScrollBar.Visible)
{
Hadjustment.AddValueClamped(args.Direction == ScrollDirection.Right ? 10 : -10);
}
if ((args.Direction == ScrollDirection.Up ||
args.Direction == ScrollDirection.Down) && vScrollBar.Visible)
{
Vadjustment.AddValueClamped(args.Direction == ScrollDirection.Down ? 10 : -10);
}
base.OnMouseScrolled(args);
}
private void SetSize(int x, int y, int width, int height)
{
Hadjustment.Upper = Math.Max(Allocation.Width, width);
Vadjustment.Upper = Math.Max(Allocation.Height, height);
bool xchange = scroll && (int)(Hadjustment.Value) != x;
bool ychange = scroll && (int)(Vadjustment.Value) != y;
// reset scroll
scroll = false;
if (IsRealized)
{
BinWindow.FreezeUpdates();
}
if (xchange || ychange)
{
if (IsRealized)
{
BinWindow.MoveResize(-x, -y, (int)(Hadjustment.Upper), (int)(Vadjustment.Upper));
}
Vadjustment.Value = y;
Hadjustment.Value = x;
}
if (this.Width != Allocation.Width || this.Height != Allocation.Height)
{
SetSize((uint)Allocation.Width, (uint)height);
}
if (xchange || ychange)
{
Vadjustment.ChangeValue();
Hadjustment.ChangeValue();
}
if (IsRealized)
{
BinWindow.ThawUpdates();
BinWindow.ProcessUpdates(true);
}
}
private void UpdateAdjustments()
{
RectangleD drawing_box = Drawing.DisplayBox;
drawing_box.Add(VisibleArea);
Hadjustment.PageSize = Allocation.Width;
Hadjustment.PageIncrement = Allocation.Width * 0.9;
Hadjustment.StepIncrement = 1.0;
Hadjustment.Lower = drawing_box.X;
Hadjustment.Upper = drawing_box.X2;
Hadjustment.Change();
Vadjustment.PageSize = Allocation.Height;
Vadjustment.PageIncrement = Allocation.Height * 0.9;
Vadjustment.StepIncrement = 1.0;
Vadjustment.Lower = drawing_box.Y;
Vadjustment.Upper = drawing_box.Y2;
Vadjustment.Change();
}