A Closer Look at Context Menus in TX Text Control
We have received several e-mails this week from users wanting to have a context menu pop up when they click into a TX Text Control window. In this newsletter, we are going to show you this can be achieved.
In the sample program, a quotation is loaded when the TX Text Control program starts. This quotation contains a table in which we want the context menu to appear. When the user clicks the table with the right mouse, the table id and the column in which the user clicked are calculated. The popup menu then appears and allows the user to add a row above or below the clicked row.
How can this be done? First of all, we need the position in the document where the user clicked. This can be achieved easily by calling InputPosFromPoint. Then we use LockWindowUpdate to prevent the user from seeing what we are about to do.
We set the cursor position to the value we just received and call TableAtInputPos to check if there is a table. Also, we use TableRowAtInputPos and TableColAtInputPos to determine the column and row in the table. After that, we restore the input position and unlock the window update.
Now, we can show the popup menu...
Here is the code:
Private Sub TXTextControl1_MouseDown(Button As
Integer, Shift As Integer, X As Single, Y As Single)
Dim nCurPos, nInputPos As Integer
If (Button = 2) Then
nCurPos = TXTextControl1.SelStart
nInputPos = TXTextControl1.InputPosFromPoint(X, Y)
TXTextControl1.LockWindowUpdate = True
TXTextControl1.SelStart = nInputPos
g_nCurTableID = TXTextControl1.TableAtInputPos
g_nCurRow = TXTextControl1.TableRowAtInputPos
g_nCurCol = TXTextControl1.TableColAtInputPos
TXTextControl1.SelStart = nCurPos
TXTextControl1.LockWindowUpdate = False
If (g_nCurTableID <> 0 And g_nCurRow > 1) Then
Form1.PopupMenu mnuPopup, 0, X, Y
Of course, there are many more possibilities to use context menus in this way. For example, you could dynamically add a list of products to the popup menu and let the user add these to the table. Or whatever you can think off.
As every you can download the source code to this example.
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The Newsletter Team