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Reproducable with gtk2 and qt under linux. |
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This isn't a bug of Lazarus. You have anchored Panel2.Bottom to no sibling and Panel3.Top to Panel2.Bottom. When you now change the height of Panel3, that it doesn't fit in the scrollbox anymore, the scrollbox is resized. With resizing of the scrollbox, Panel2 is also resized (because its Bottom is anchored). Now Panel3.Top is moved too and Panel3 doesn't fit in the scrollbox anymore. And repeat. To fix that issue, remove the anchoring of Panel2.Bottom. The only thing, that need to fixed here is to prevent the IDE crash, if you change the height of Panel3 in designtime. As till now, TScrollingWincontrol scrollbars doesn't work in designtime, I disabled them in trunk revision 55249. Of course if TScrollingWincontrol scrollbars working in designtime is fixed, this workaround has to be removed and a better fix has to be found. Please close. |
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position_range_overflow.png (28,336 bytes) |
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InvalidatePreferredSize problem gone after applied your suggestion. But I see an other problem with my real life application. Attached a second example project (and a screenshot) for demonstrating it. Panel1 is static, Panel2 follow the size of the form/scrollbox, Panel3 resizable by the user. If start the attached example, click on the Panel3, got "Position range overflow..." error. I am wrong again or is this a bug? |
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This isn't a bug of Lazarus, see comment above. I add a example for your needs, how I understand it, what you want. Please close. |
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Thank you for the example but do not do what I want. I start a thread on the mailing list with my problem and will close this issue. |
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As I have reverted revision 55249 (it breaks scrolling in designer by setting the VertScrollBar/HorzScrollBar.Position property), the crash of the IDE needs to be prevented. I add a simplified project, what crahes the IDE. Simple increase the height of Panel1 in designer. |
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- Anonymous
