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Topic: New features for utility authors (Read 1672 times) |
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Malcolm
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Re: New features for utility authors
« Reply #1 on: Mar 27th, 2011, 5:57pm » |
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I am having trouble with the EMU_CURSOR message.
I call
SYS"SendMessage", hEdit%, 1031, 1, IDC_WAIT
SYS"SendMessage", hEdit%, WM_SETREDRAW, 0, 0
from another program which disables further selection / highlighting and freezes the window but leaves the text editing caret. Should I expect this? If I want to show a busy mouse pointer is there more I have to do?
Malcolm.
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admin
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Re: New features for utility authors
« Reply #2 on: Mar 27th, 2011, 9:36pm » |
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on Mar 27th, 2011, 5:57pm, Guest-Malcolm wrote:| Should I expect this? If I want to show a busy mouse pointer is there more I have to do? |
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EMU_CURSOR is message 1032, not 1031 (and I've redacted embarrassing evidence to the contrary  ).
Richard.
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Malcolm
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Re: New features for utility authors
« Reply #3 on: Mar 28th, 2011, 03:26am » |
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Thanks, Richard.
Unfortunately the use of WM_SETREDRAW seem to undo this call, so you don't seem to be able to show a WAIT cursor and have the IDE frozen to stop automatic scrolling from line insertions until they were complete. It was in an attempt to let the user know that the IDE was temporarily unavailable that I was going to change the mouse pointer.
regards,
Malcolm
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Malcolm
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Re: New features for utility authors
« Reply #4 on: Mar 28th, 2011, 04:17am » |
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Additionally, calling EMU_CURSOR messages removes any IDE selections made at the time.
Malcolm.
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admin
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Re: New features for utility authors
« Reply #5 on: Mar 28th, 2011, 08:53am » |
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on Mar 28th, 2011, 03:26am, Guest-Malcolm wrote:| Unfortunately the use of WM_SETREDRAW seem to undo this call |
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I don't process WM_SETREDRAW at all, so any effects you see from that message are the default Windows processing, and out of my control. I'm a little surprised if it changes the mouse cursor - nothing in the Microsoft docs suggests that it will.
Quote:| Additionally, calling EMU_CURSOR messages removes any IDE selections made at the time. |
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Yes, deselection is a side-effect. You could re-select the same region immediately after changing the cursor, although that would cause the IDE to scroll to the selected region (note that other editors, like Notepad, also exhibit this effect).
Quote:| so you don't seem to be able to show a WAIT cursor and have the IDE frozen to stop automatic scrolling from line insertions until they were complete. |
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The unwanted scrolling presumably occurs because you are inserting the lines individually. If they are a contiguous block of lines, and you insert them in one EM_REPLACESEL or WM_PASTE operation, the IDE automatically delays the screen update until the entire insertion has completed.
Richard.
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Malcolm
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Re: New features for utility authors
« Reply #6 on: Mar 28th, 2011, 2:27pm » |
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Thanks for the comments.
Quote:| I'm a little surprised if it changes the mouse cursor - nothing in the Microsoft docs suggests that it will. |
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As was I, and I would be delighted if you prove me wrong on this point.
Malcolm.
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admin
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Re: New features for utility authors
« Reply #7 on: Mar 28th, 2011, 4:42pm » |
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on Mar 28th, 2011, 2:27pm, Guest-Malcolm wrote:| I would be delighted if you prove me wrong on this point. |
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If you perform this sequence:
Change cursor to IDC_WAIT (EMU_CURSOR message)
Disable redraw (WM_SETREDRAW, 0)
Enable redraw (WM_SETREDRAW, 1) the cursor is still the 'hourglass'. From that I conclude that WM_SETREDRAW isn't changing the cursor shape, but it is preventing the cursor being redrawn when it enters the window.
The practical consequence is likely to be the same (you can't display the hourglass cursor if redrawing is disabled) so you may argue the distinction is academic, but at least it isn't working contrary to the documentation.
Has my suggestion of inserting multiple lines in one 'chunk' made it unnecessary to disable redrawing, and therefore unnecessary to display the hourglass?
Richard.
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Malcolm
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Re: New features for utility authors
« Reply #8 on: Mar 28th, 2011, 9:17pm » |
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Quote:| Has my suggestion of inserting multiple lines in one 'chunk' made it unnecessary to disable redrawing, and therefore unnecessary to display the hourglass? |
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It is quite possible that it may but I am not sure yet. To retrieve a multi-lined block the clipboard is the only way I could see to do it, or is there another way?
I was getting a line at a time and so inserting only a line at a time or some blank lines for formatting.
Malcolm.
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admin
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Re: New features for utility authors
« Reply #9 on: Mar 28th, 2011, 10:26pm » |
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on Mar 28th, 2011, 9:17pm, Guest-Malcolm wrote:| To retrieve a multi-lined block the clipboard is the only way I could see to do it, or is there another way? |
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Why would you want to retrieve a multi-lined block? Reading lines (using EM_GETLINE) doesn't result in scrolling or any other display disturbance, so there shouldn't be any issue with doing that one line at a time.
Quote:I was getting a line at a time and so inserting only a line at a time or some blank lines for formatting.
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Obviously I don't know what your code is doing, but I can't see why reading lines one-at-a-time should imply also inserting them individually.
The Windows Constants utility is a good example to follow. The entire program is read one line at a time, but the constant declarations are inserted in one block using WM_PASTE.
Richard.
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