home *** CD-ROM | disk | FTP | other *** search
- LEdit Version 1.08
-
-
- Frequently Asked Questions:
-
-
-
- Question: I have the LEdit package with the Delphi VCL and entered code into
- the OnTimeToLoadText event that causes my program to lock up. Why?
-
- Answer: It is likely that you are setting the Filename property from within
- the OnTimeToLoadText event. This cannot be done. If you set the
- Filename property in the OnTimeToLoadText event, it will cause your
- program to go into an endless loop.
-
- --------------------------------------------------------------------------------
-
- Question: My program that uses one of the LEdit wrappers has developed a
- memory leak and I cannot find anything wrong with my code. How can
- I fix this?
-
- Answer: When using the Text and TextHandle properties in the LEdit
- wrappers, memory is allocated to hold the text. We do not free this
- memory since you may want to do something else with it. You must free
- this memory yourself by calling the BurnHandle method and passing it
- the memory Handle returned by the Text and TextHandle properties.
-
- --------------------------------------------------------------------------------
-
- Question: If I choose a background color that is, for example light
- yellow, the BGcolor is not displayed (with paintmode NORMAL). Dark
- yellow works fine. If I choose PaintMode=Direct then it looks fine
- until I scroll. Then it all becomes messed up.
-
- Answer: In Windows there are pure colors and mixed colors. Pure colors
- are maintained by the video adapter. Mixed colors are created by
- Windows by interleaving pixels of different pure color. LEdit (and all
- text drawing functions) maintains only pure colors. For most adapters
- this is only 16 basic colors. You can work directly with the palettes
- to make more true colors if you have a 256 or higher color adapters.
- For true-color video adapters all colors are automatically pure.
-
- If you choose PaintMode=Direct, LEdit does not draw the background
- at all. You need to draw the background yourself in the OnPaint event.
- This causes it to flicker. You may want to switch to
- PaintMode=UseMemoryDC. This will eliminate the flicker but will slow
- down the speed a little.
-
- --------------------------------------------------------------------------------
-
- Question: Is there a way to change the caption in the message boxes from
- LEDIT? It now displays Ledit V1.01 custum control. I want to place
- something else in it.
-
- Answer: Sure. You can do it directly by changing the resources inside
- the LEDIT.DLL if you have a safe tool to do it with, like Resource
- Workshop. If not, we can change it for you. Just let us know what to
- change.
-
- --------------------------------------------------------------------------------
-
- Question: When I Close the application I want to give the user a way
- to save the text. But the Modified property does not work the way I
- expected. Anyway can you show me how I can do this? And if the user
- wants to save a file and clicks on Cancel, the Modified property is
- not changed? This is with the VCL.
-
- Answer: Take a look at the CanClose property. It will do all the work
- for you. It determines if you should close or if the user clicked
- "Cancel". If you want to change its behaviour, you may want to look at
- the OnGoingToClose and OnAskIfStoreFile events.
-
- --------------------------------------------------------------------------------
-
- Question: FindBrace doesn't seem to work in the VCL, even in your example
- program. How do I make it work?
-
- Answer: This is because of a change we had to make in V1.04 to the
- BraceStyle type. We had to rename all the options to 'br' instead of
- 'bs'. We failed to update the example. If you change all the 'bs'
- options to 'br' for BraceType in the example, it should fix the
- problem.
-
- The way to tell if it is working is to right click in the LEdit window,
- bringing up the popup menu. If the cursor is not on a starting brace
- then the 'Find Brace' option will not be available. If the cursor is on
- a brace, the 'Find Brace' option on the popup menu will be available.
- If you select it, the cursor will jump to the opposite brace. In the
- Pascal example, the starting brace is the word 'begin' and the ending
- brace is the word 'end' If the cursor is on either of these words,
- then the 'Find Brace' option will be available.
-
- --------------------------------------------------------------------------------
-
- Question: How do I do HTML syntax highlighting in LEdit with the VCL?
-
- Answer: This is very easy to do in LEdit. Basically, the way it works is
- that you treat everything outside the HTML tags as comments and then
- color the tags whichever color you wish. To do this, you first need to
- set the Syntax property to:
-
- 0001>1<
-
- Then place the following code into the OnControlHighlight event.
-
- ForeClr := FTagForeColor;
- BackClr := FTagBackColor;
- LEdit1.MsgResult := 3;
-
- FTagForeColor and FTagBackColor are variables defined as:
-
- FTagForeColor: TColor;
- FTagBackColor: TColor;
-
- Place the foreground and background colors into these variables and
- the HTML tags will be colored this color.
-
- Finally, set the StartInComments property to True.
-
- This is all that is needed to have color syntax highlighting of HTML
- tags. A new example of this is now included in the Delphi packages.
-
- --------------------------------------------------------------------------------
-