 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
ctlUniCanvas
Unicode API window that you can use like a normal DC. You can draw into this area using normal API functions and you can receive events with Unicode data for KeyPress, KeyDown, KeyUp. The "Label Editor" dialog used in my Dynamic HTML Editor program uses a ctlUniCanvas object to catch Unicode keys ;-)
This control supports IME input. |
|
 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
>>Common properties
Some Properties/Methods: |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| ClientWidth / ClientHeight |
gives you the client area of the control |
| IsInIME |
You can use this property for knowing if the KeyPress, KeyDown and KeyUp events have been raised by the active IME window associated to your control. By using this property in the KeyPress event you can avoid the IME text. See here. |
| Refresh |
Force the redraw of the control, pass the "bNow" flag to "True" to redraw it immediately (without waiting for Windows events). |
| TrapTabKey |
permits you to trap the tab character |
| UseMouseSetCapture |
permits you to capture the mouse movements even if the mouse is out of the control (when pressing the mouse button into the control and then exiting from it maintaining the button pressed) like a normal PictureBox control | |
|
|
|
|
Events: |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| CanvasGotFocus / CanvasLostFocus |
raised when the control get/lost the focus. This works, the VB6 one don't. |
| IMEComposition |
see here |
| KeyDown / KeyPress / KeyUp |
the Keyascii or Keycode parameter can have negative values (because the Unicode uses 1 unsigned integer and the VB6 declaration of these events has only 1 signed integer; so no data is lost but the value may arrive negative).
You can manage the KeyAscii / KeyCode value simply by using the clsCommonWrapper.ChrW or AscW methods.
It's also possible to obtain the real Unsigned Integer (using a VB6 long) from the negative value simply by converting the KeyAscii / KeyCode value to a Long using the clsCommonWrapper.MakeDWord (KeyAscii, 0) method. |
| Paint |
raised when the control need to be redrawn | |
|
|
|
|
How to use this control:
Simply manage the Paint Event, it gives you a Device Context that you can use to draw. The DC passed has no memory, it's like a standard Window DC. Useful to catch Unicode characters using the KeyDown/KeyUp/KeyPress events.
You can use a clsMemDC object to create and manage Windows DC. |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
 |
|
|
|
|
|
|
A ctlUniCanvas object used to make an UNICODE text editor
(Dynamic HTML Editor) |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Sample:
Draw a ctlUniCanvas object into a Form then: |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Private oMemDC As New clsMEMDC
Private oWrap As New clsCommonWrapper
Private Sub Form_Load()
'Create the memory DC
oMemDC.CreateDC ctlUniCanvas1.ClientWidth, _
ctlUniCanvas1.ClientHeight
'Draw into DC using Windows API
oWrap.DrawRectCoords oMemDC.hDC, 0, 0, 100, 100, vbRed, True
End Sub
Private Sub ctlUniCanvas1_Paint(lHDC As Long)
'Draw the memory DC to the visible DC
oMemDC.PaintPicture lHDC
End Sub | |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
