/// <summary>
/// Occurs when an element within the <see cref="ImageComboBox"/> is drawn.
/// </summary>
/// <param name="e">The <see cref="DrawItemEventArgs"/>
/// which determines which element is being drawn.</param>
protected override void OnDrawItem(DrawItemEventArgs e)
{
var index = e.Index;
if (index != -1)
{
object item = base.Items[index];
if (item is ImageObjectItem)
{
ImageObjectItem imageItem = (ImageObjectItem)item;
DrawItemState newState = e.State;
if (!imageItem.Enabled)
{
newState |= DrawItemState.Disabled;
}
if (newState != e.State)
{
e = new DrawItemEventArgs(e.Graphics, e.Font, e.Bounds, e.Index, newState);
}
if (this.Style != null)
{
this.Style.OnDrawItemEvent(imageItem, e, this.Font);
}
}
}
base.OnDrawItem(e);
}
/// <summary>
/// Occurs when an element within the <see cref="ImageListBox"/> is drawn.
/// </summary>
/// <param name="e">The <see cref="DrawItemEventArgs"/>
/// which determines which element is being drawn.</param>
protected override void OnDrawItem(System.Windows.Forms.DrawItemEventArgs e)
{
if ((e.Index != -1) && e.Index < base.Items.Count)
{
object item = base.Items[e.Index];
if (item is ImageObjectItem)
{
ImageObjectItem imageItem = (ImageObjectItem)item;
DrawItemState k = e.State;
if (!imageItem.Enabled)
{
k |= DrawItemState.Disabled;
}
if (!this.Enabled)
{
k |= DrawItemState.ComboBoxEdit;
}
if (k != e.State)
{
e = new DrawItemEventArgs(e.Graphics, e.Font, e.Bounds, e.Index, k);
}
if (this.Style != null)
{
this.Style.OnDrawItemEvent(imageItem, e, this.Font);
}
}
}
base.OnDrawItem(e);
}
/// <summary>
/// Occurs when an element needs redrawn.
/// </summary>
/// <param name="index">The <see cref="Int32"/> value representing
/// the ordinal index of the element to redraw.</param>
private void RedrawItem(int index)
{
if ((index == -1) || (index >= this.items.Count))
{
return;
}
ImageObjectItem item = this.items[index];
DrawItemState diState = DrawItemState.Default;
Rectangle itemRect = this.GetItemRectangle(index);
foreach (int idx in this.SelectedIndices)
{
if (idx == index)
{
diState |= DrawItemState.Selected;
}
}
if (this.Focused)
{
diState |= DrawItemState.Focus;
}
DrawItemEventArgs dieas = new DrawItemEventArgs(this.CreateGraphics(), this.Font, itemRect, index, diState, this.ForeColor, this.BackColor);
this.OnDrawItem(dieas);
dieas.Graphics.Dispose();
}
private void OnItemCheckChanged(ImageObjectItem item)
{
if (this.ItemCheckChanged != null)
{
this.ItemCheckChanged(this, new ImageCheckedListBoxItemCheckChangedEventArgs(item));
}
}
/// <summary>
/// Occurs when the mouse moves within the scope of the
/// <see cref="ImageCheckedListBox"/>.
/// </summary>
/// <param name="e">The <see cref="MouseEventArgs"/>
/// which specify pertinent information about the mouse event.</param>
protected override void OnMouseMove(MouseEventArgs e)
{
ImageObjectItem newHoveredItem;
SizeF imageMetric;
if (e.Button == MouseButtons.None)
{
int itemUnderCursor = this.IndexFromPoint(new Point(e.X, e.Y));
if (itemUnderCursor != -1 && itemUnderCursor != 65535)
{
Rectangle itemRect = this.GetItemRectangle(itemUnderCursor);
newHoveredItem = this.items[itemUnderCursor];
if ((newHoveredItem != this.hoveredItem) && (this.hoveredItem != null))
{
if (this.hoveredItem.CheckAreaHovered)
{
this.hoveredItem.CheckAreaHovered = false;
}
}
if (this.imageList == null)
{
imageMetric = new SizeF(16, 16);
}
else
{
imageMetric = new SizeF(this.imageList.ImageSize.Width, this.imageList.ImageSize.Height);
}
if ((e.X >= itemRect.Left + 3 && e.X < itemRect.Left + 3 + imageMetric.Width) && (e.Y >= itemRect.Top + ((itemRect.Height - imageMetric.Height) / 2) && e.Y < itemRect.Top + ((itemRect.Height + imageMetric.Height) / 2)))
{
if (!newHoveredItem.CheckAreaHovered)
{
newHoveredItem.CheckAreaHovered = true;
}
}
else
if (newHoveredItem.CheckAreaHovered)
{
newHoveredItem.CheckAreaHovered = false;
}
this.hoveredItem = newHoveredItem;
}
else
{
if (hoveredItem != null && hoveredItem.CheckAreaHovered)
{
hoveredItem.CheckAreaHovered = false;
}
hoveredItem = null;
}
}
base.OnMouseMove(e);
}
/// <summary>
/// Occurs when an element within the <see cref="ImageListBox"/> is measured.
/// </summary>
/// <param name="e">The <see cref="MeasureItemEventArgs"/>
/// which determines the specific item to be measured.</param>
protected override void OnMeasureItem(System.Windows.Forms.MeasureItemEventArgs e)
{
if (e.Index < base.Items.Count)
{
object item = base.Items[e.Index];
if (item is ImageObjectItem)
{
ImageObjectItem imageItem = (ImageObjectItem)item;
SizeF stringSize = e.Graphics.MeasureString(imageItem.Text, this.Font);
e.ItemHeight = this.GetBaseItemHeight(e.Graphics, stringSize);
if (this.Style != null)
{
this.Style.OnMeasureItemEvent(imageItem, ref e, this.Font);
}
}
}
base.OnMeasureItem(e);
}
/// <summary>
/// Occurs when the selection changes.
/// </summary>
/// <param name="e">The <see cref="EventArgs"/> which contains the parameters
/// on the event.</param>
protected override void OnSelectedIndexChanged(EventArgs e)
{
ImageObjectItem selection = this.SelectedItem as ImageObjectItem;
if (selection != null && !selection.Enabled)
{
voidingSelect = true;
this.SelectedItem = lastSelection;
voidingSelect = false;
}
else if (!voidingSelect)
{
base.OnSelectedIndexChanged(e);
}
if ((selection != null && selection.Enabled) ||
selection == null)
{
this.lastSelection = selection;
}
}
/// <summary>
/// Occurs when an element within the <see cref="ImageCheckedListBox"/> is drawn.
/// </summary>
/// <param name="e">The <see cref="DrawItemEventArgs"/>
/// which determines which element is being drawn.</param>
protected override void OnDrawItem(DrawItemEventArgs e)
{
if ((e.Index != -1) && e.Index < base.Items.Count)
{
object item = base.Items[e.Index];
if (item is ImageObjectItem)
{
ImageObjectItem imageItem = (ImageObjectItem)item;
DrawItemState diState = e.State;
if (imageItem.Checked)
{
diState |= DrawItemState.Checked;
}
DrawItemEventArgs newArgs = new DrawItemEventArgs(e.Graphics, e.Font, e.Bounds, e.Index, diState);
if (this.Style != null)
{
this.Style.OnDrawItemEvent(imageItem, newArgs, this.Font);
}
}
}
base.OnDrawItem(e);
}
