#286 MUI setting for transparent header labels

[realthunder]

I am using MUI NSIS 2.15 on XP.

When a static control is set to be transparent, it is
not redraw correctly when the text content is
changed. The new text and old text are overlaid.

I wonder how NSIS achieves transparent control. Using
WM_CTLCOLOR? Simply ignore the background redraw?
Then the problem makes sense. It doesn't erase the
old content. I think the proper way to achieve
transparency is to use WS_EX_TRANSPARENT. But,
anyway, that style is also problematic. The easiest
way to fix this problem is to hide the window, change
the text, and show the window again. I made some
change to MUI to do that.

Or, any better idea?

[Amir Szekely]

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SetCtlColors sets the return value of WM_CTLCOLOR for a
control. If you choose transparent, it'll return a hollow
brush. If you set a control to transparent and update the
text, it's up to you to update the window as well, either by
hiding and showing it or by calling UpdateWindow with System.

Is your problem with the MUI itself where you set some
control of the MUI with transparent background and get this
problem? Maybe a define for the MUI saying "clean before
setting text" would do. Or you could just update the
appropriate controls in the show function of the page.

[realthunder]

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Yes, it's true. I stretch the header image to occupy the
whole title region. So, I need the title text to be
transparent. Patching MUI is much easier. Or else, I have
to add custom function for all pages.

[Amir Szekely]

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I've added MUI_HEADER_TRANSPARENT_TEXT which causes the MUI
to use SetCtlColors transparent on the header's label
controls and refresh them after setting the text.