/// <summary>
/// <para>Constructs a new <see cref="T:Xsharp.InputOnlyWidget"/>
/// instance underneath a specified parent widget.</para>
/// </summary>
///
/// <param name="parent">
/// <para>The parent of the new widget.</para>
/// </param>
///
/// <param name="x">
/// <para>The X co-ordinate of the top-left corner of
/// the new widget.</para>
/// </param>
///
/// <param name="y">
/// <para>The Y co-ordinate of the top-left corner of
/// the new widget.</para>
/// </param>
///
/// <param name="width">
/// <para>The width of the new widget.</para>
/// </param>
///
/// <param name="height">
/// <para>The height of the new widget.</para>
/// </param>
///
/// <exception cref="T:System.ArgumentNullException">
/// <para>Raised if <paramref name="parent"/> is <see langword="null"/>.
/// </para>
/// </exception>
///
/// <exception cref="T:Xsharp.XException">
/// <para>Raised if <paramref name="x"/>, <paramref name="y"/>,
/// <paramref name="width"/>, or <paramref name="height"/> are
/// out of range.</para>
/// </exception>
///
/// <exception cref="T.Xsharp.XInvalidOperationException">
/// <para>Raised if <paramref name="parent"/> is disposed or the
/// root window.</para>
/// </exception>
public InputOnlyWidget(Widget parent, int x, int y, int width, int height)
: base(GetDisplay(parent, false), GetScreen(parent),
DrawableKind.InputOnlyWidget, parent)
{
bool ok = false;
try
{
// Validate the position and size.
if (x < -32768 || x > 32767 ||
y < -32768 || y > 32767)
{
throw new XException(S._("X_InvalidPosition"));
}
if (width < 1 || width > 32767 ||
height < 1 || height > 32767 ||
!ValidateSize(width, height))
{
throw new XException(S._("X_InvalidSize"));
}
// Set the initial position and size of the widget.
this.x = x;
this.y = y;
this.width = width;
this.height = height;
this.focusable = true;
// Lock down the display and create the window handle.
try
{
IntPtr display = dpy.Lock();
XWindow pwindow = parent.GetWidgetHandle();
XWindow window = Xlib.XCreateWindow
(display, pwindow,
x, y, (uint)width, (uint)height, (uint)0,
0 /* depth */, 2 /* InputOnly */,
screen.DefaultVisual,
(uint)0, IntPtr.Zero);
SetWidgetHandle(window);
if (parent.AutoMapChildren)
{
Xlib.XMapWindow(display, window);
mapped = true;
}
}
finally
{
dpy.Unlock();
}
// Push the widget down to the default layer.
layer = 0x7FFFFFFF;
Layer = 0;
ok = true;
// Select for mouse events.
SelectInput(EventMask.ButtonPressMask |
EventMask.ButtonReleaseMask |
EventMask.EnterWindowMask |
EventMask.LeaveWindowMask |
EventMask.PointerMotionMask);
}
finally
{
if (!ok)
{
// Creation failed, so detach ourselves from
// the parent's widget tree.
Detach(false);
}
}
}
// Internal constructor that is used by the "InputOutputWidget" subclass.
internal InputOnlyWidget(Widget parent, int x, int y,
int width, int height, Color background,
bool rootAllowed, bool overrideRedirect)
: base(GetDisplay(parent, rootAllowed), GetScreen(parent),
DrawableKind.Widget, parent)
{
bool ok = false;
try
{
// Validate the position and size.
if (x < -32768 || x > 32767 ||
y < -32768 || y > 32767)
{
throw new XException(S._("X_InvalidPosition"));
}
if (width < 1 || width > 32767 ||
height < 1 || height > 32767 ||
!ValidateSize(width, height))
{
throw new XException(S._("X_InvalidSize"));
}
// Set the initial position and size of the widget.
this.x = x;
this.y = y;
this.width = width;
this.height = height;
this.focusable = true;
// Lock down the display and create the window handle.
try
{
IntPtr display = dpy.Lock();
XWindow pwindow = parent.GetWidgetHandle();
XSetWindowAttributes attrs = new XSetWindowAttributes();
attrs.override_redirect = overrideRedirect;
XWindow window = Xlib.XCreateWindow
(display, pwindow,
x, y, (uint)width, (uint)height, (uint)0,
screen.DefaultDepth, 1 /* InputOutput */,
screen.DefaultVisual,
(uint)(CreateWindowMask.CWOverrideRedirect),
ref attrs);
SetWidgetHandle(window);
if (background.Index == StandardColor.Inherit)
{
Xlib.XSetWindowBackgroundPixmap
(display, window, XPixmap.ParentRelative);
}
else
{
Xlib.XSetWindowBackground(display, window,
ToPixel(background));
}
if (parent.AutoMapChildren)
{
Xlib.XMapWindow(display, window);
mapped = true;
}
}
finally
{
dpy.Unlock();
}
// Push the widget down to the default layer.
layer = 0x7FFFFFFF;
Layer = 0;
ok = true;
// Select for mouse events.
SelectInput(EventMask.ButtonPressMask |
EventMask.ButtonReleaseMask |
EventMask.EnterWindowMask |
EventMask.LeaveWindowMask |
EventMask.PointerMotionMask);
}
finally
{
if (!ok)
{
// Creation failed, so detach ourselves from
// the parent's widget tree.
Detach(false);
}
}
}
