/// <summary>Called when the control should be rendered</summary>
public override void Render(Device device, float elapsedTime)
{
ControlState state = ControlState.Normal;
if (!isComboOpen)
{
state = ControlState.Hidden;
}
// Dropdown box
Element e = elementList[ComboBox.DropdownLayer] as Element;
// If we have not initialized the scroll bar page size,
// do that now.
if (!isScrollBarInit)
{
FontNode fNode = DialogResourceManager.GetGlobalInstance().GetFontNode((int)e.FontIndex);
if ((fNode != null) && (fNode.Height > 0))
{
scrollbarControl.PageSize = (int)(dropDownTextRect.Height / fNode.Height);
}
else
{
scrollbarControl.PageSize = dropDownTextRect.Height;
}
isScrollBarInit = true;
}
if (isComboOpen)
{
scrollbarControl.Render(device, elapsedTime);
}
// Blend current color
e.TextureColor.Blend(state, elapsedTime);
e.FontColor.Blend(state, elapsedTime);
parentDialog.DrawSprite(e, dropDownRect);
// Selection outline
Element selectionElement = elementList[ComboBox.SelectionLayer] as Element;
selectionElement.TextureColor.Current = e.TextureColor.Current;
selectionElement.FontColor.Current = selectionElement.FontColor.States[(int)ControlState.Normal];
FontNode font = DialogResourceManager.GetGlobalInstance().GetFontNode((int)e.FontIndex);
int currentY = dropDownTextRect.Top;
int remainingHeight = dropDownTextRect.Height;
for (int i = scrollbarControl.TrackPosition; i < itemList.Count; i++)
{
ComboBoxItem cbi = (ComboBoxItem)itemList[i];
// Make sure there's room left in the dropdown
remainingHeight -= (int)font.Height;
if (remainingHeight < 0)
{
// Not visible, store that item
cbi.IsItemVisible = false;
itemList[i] = cbi; // Store this back in list
continue;
}
cbi.ItemRect = new System.Drawing.Rectangle(dropDownTextRect.Left, currentY,
dropDownTextRect.Width, (int)font.Height);
cbi.IsItemVisible = true;
currentY += (int)font.Height;
itemList[i] = cbi; // Store this back in list
if (isComboOpen)
{
if (focusedIndex == i)
{
System.Drawing.Rectangle rect = new System.Drawing.Rectangle(
dropDownRect.Left, cbi.ItemRect.Top - 2, dropDownRect.Width,
cbi.ItemRect.Height + 4);
parentDialog.DrawSprite(selectionElement, rect);
parentDialog.DrawText(cbi.ItemText, selectionElement, cbi.ItemRect);
}
else
{
parentDialog.DrawText(cbi.ItemText, e, cbi.ItemRect);
}
}
}
int offsetX = 0;
int offsetY = 0;
state = ControlState.Normal;
if (IsVisible == false)
{
state = ControlState.Hidden;
}
else if (IsEnabled == false)
{
state = ControlState.Disabled;
}
else if (isPressed)
{
state = ControlState.Pressed;
offsetX = 1;
offsetY = 2;
}
else if (isMouseOver)
{
state = ControlState.MouseOver;
offsetX = -1;
offsetY = -2;
}
else if (hasFocus)
{
state = ControlState.Focus;
}
float blendRate = (state == ControlState.Pressed) ? 0.0f : 0.8f;
// Button
e = elementList[ComboBox.ComboButtonLayer] as Element;
// Blend current color
e.TextureColor.Blend(state, elapsedTime, blendRate);
System.Drawing.Rectangle windowRect = buttonRect;
windowRect.Offset(offsetX, offsetY);
// Draw sprite
parentDialog.DrawSprite(e, windowRect);
if (isComboOpen)
{
state = ControlState.Pressed;
}
// Main text box
e = elementList[ComboBox.MainLayer] as Element;
// Blend current color
e.TextureColor.Blend(state, elapsedTime, blendRate);
e.FontColor.Blend(state, elapsedTime, blendRate);
// Draw sprite
parentDialog.DrawSprite(e, textRect);
if (selectedIndex >= 0 && selectedIndex < itemList.Count)
{
try
{
ComboBoxItem cbi = (ComboBoxItem)itemList[selectedIndex];
parentDialog.DrawText(cbi.ItemText, e, textRect);
}
catch { } // Ignore
}
}
/// <summary>Called when the control should handle the mouse</summary>
public override bool HandleMouse(NativeMethods.WindowMessage msg, System.Drawing.Point pt, IntPtr wParam, IntPtr lParam)
{
if (!IsEnabled || !IsVisible)
{
return(false); // Nothing to do
}
// Let the scroll bar handle it first
if (scrollbarControl.HandleMouse(msg, pt, wParam, lParam))
{
return(true);
}
// Ok, scrollbar didn't handle it, move on
switch (msg)
{
case NativeMethods.WindowMessage.MouseMove:
{
if (isComboOpen && dropDownRect.Contains(pt))
{
// Determine which item has been selected
for (int i = 0; i < itemList.Count; i++)
{
ComboBoxItem cbi = (ComboBoxItem)itemList[i];
if (cbi.IsItemVisible && cbi.ItemRect.Contains(pt))
{
focusedIndex = i;
}
}
return(true);
}
break;
}
case NativeMethods.WindowMessage.LeftButtonDoubleClick:
case NativeMethods.WindowMessage.LeftButtonDown:
{
if (ContainsPoint(pt))
{
// Pressed while inside the control
isPressed = true;
Parent.SampleFramework.Window.Capture = true;
if (!hasFocus)
{
Dialog.RequestFocus(this);
}
// Toggle dropdown
if (hasFocus)
{
isComboOpen = !isComboOpen;
if (!isComboOpen)
{
if (!parentDialog.IsUsingKeyboardInput)
{
Dialog.ClearFocus();
}
}
}
return(true);
}
// Perhaps this click is within the dropdown
if (isComboOpen && dropDownRect.Contains(pt))
{
// Determine which item has been selected
for (int i = scrollbarControl.TrackPosition; i < itemList.Count; i++)
{
ComboBoxItem cbi = (ComboBoxItem)itemList[i];
if (cbi.IsItemVisible && cbi.ItemRect.Contains(pt))
{
selectedIndex = focusedIndex = i;
RaiseChangedEvent(this, true);
isComboOpen = false;
if (!parentDialog.IsUsingKeyboardInput)
{
Dialog.ClearFocus();
}
break;
}
}
return(true);
}
// Mouse click not on main control or in dropdown, fire an event if needed
if (isComboOpen)
{
focusedIndex = selectedIndex;
RaiseChangedEvent(this, true);
isComboOpen = false;
}
// Make sure the control is no longer 'pressed'
isPressed = false;
// Release focus if appropriate
if (!parentDialog.IsUsingKeyboardInput)
{
Dialog.ClearFocus();
}
break;
}
case NativeMethods.WindowMessage.LeftButtonUp:
{
if (isPressed && ContainsPoint(pt))
{
// Button click
isPressed = false;
Parent.SampleFramework.Window.Capture = false;
return(true);
}
break;
}
case NativeMethods.WindowMessage.MouseWheel:
{
int zdelta = (short)NativeMethods.HiWord((uint)wParam.ToInt32()) / Dialog.WheelDelta;
if (isComboOpen)
{
scrollbarControl.Scroll(-zdelta * System.Windows.Forms.SystemInformation.MouseWheelScrollLines);
}
else
{
if (zdelta > 0)
{
if (focusedIndex > 0)
{
focusedIndex--;
selectedIndex = focusedIndex;
if (!isComboOpen)
{
RaiseChangedEvent(this, true);
}
}
}
else
{
if (focusedIndex + 1 < NumberItems)
{
focusedIndex++;
selectedIndex = focusedIndex;
if (!isComboOpen)
{
RaiseChangedEvent(this, true);
}
}
}
}
return(true);
}
}
// Didn't handle it
return(false);
}