Managing card text in WebCard
The text of WebCard cards is intended to be read only but my previous attempt to achieve it by overriding card editing didn't work. I implemented a new, simpler approach that actually works.
The card type Web inherits from the Text type whose “substance” is a text stream associated with the TEdit editor embedded in Text cards. In NoteCards a substance is a data structure that contains the information in the card.
The trick of the new approach is to just make the text stream of the card read only.
An additional complication is that the read only state is a runtime property of open streams not preserved in saved notefiles. Therefore, if in a new session you load a notefile, any previously read only cards it stores will no longer be so. To catch this WebCard now intercepts the first access to an unopened Web card, which occurs when clicking a link icon to the card. I modified WCD.TraverseWebLink to set the text to read only.
If the user clicks the text area of a Web card and starts typing, a dialog informs that the text is read only. The Close option of the right-click menu dismisses the dialog.
A number of WebCard functions display the URL of a Web card in its text area. Since the code for inserting the text and handling the modification state was scattered and partially duplicated in various places, I factored it out into the new function WCD.UpdateCardText. It sets the card text to read-write, clears the existing text, inserts the new text, and makes the text read only again.
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