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IDProjectCategoryView StatusLast Update
0018040LazarusLCLpublic2010-11-25 08:42
ReporterTorsten Bonde Christiansen Assigned ToPaul Ishenin  
Status closedResolutionfixed 
Product Version0.9.29 (SVN) 
Target Version1.0.0Fixed in Version0.9.29 (SVN) 
Summary0018040: Hint windows showing on wrong monitor
DescriptionDisplaying a hint using the 'hint' string on a control or self-created hint form places the hint window on the wrong monitor on some occasions.

This does also happen within the IDE itself - eg. showing tool-top for identifiers etc.

More specifically this only happens if the hint is close enought to the 2nd monitor, but never when far from. In my case I have two monitor - primary on the left and secondary on the right.
Additional InformationA little research gave that calculation the monitor to show the hint is based on TScreen.MonitorFromPoint. Since GTk2 does not have support for MonitorFromPoint the MonitorFromRect is called with "point" and (Top,Left) and (Bottom,Right).

This leads to MonitorFromRect (falsely) calculates Rect as NOT intersecting the designated monitor and instead a distance measure is used. This distance calculation only work correctly if the actual Rect is outside scope of any monitor.

Three possible solutions may fix this:

1) Use MonitorFromRec instead in ActivateHint (since a rect is already provided).
2) Do not use same point as TopLeft and BottomRight, eg. add 1 to Bottom and Right.
2) Do not use IntersectRect in TScreen.MonitorFromRect to find correct monitor - since it doesn't accept single points.

Additional information:
Lazarus 0.9.29 r28448M FPC 2.4.0 x86_64-linux-gtk 2
Ubuntu 10.04
TagsNo tags attached.
Fixed in Revision28458
WidgetsetGTK 2
Attached Files


Paul Ishenin

2010-11-24 15:51

manager   ~0043477

Fun :) Just fixed with the second solution and found your report. Please test and close if ok.

Torsten Bonde Christiansen

2010-11-24 20:22

reporter   ~0043489

hehe... nice job. Although may I ask why you chose the second solution? I thought it more natural to use the first solution as a rect is already provided, to which I understand is the user/programmers choice of where the rect should be (and hence also it's height and width).

Will close bug-report tomorrow - curious for an answer ;)

Issue History

Date Modified Username Field Change
2010-11-24 14:56 Torsten Bonde Christiansen New Issue
2010-11-24 14:56 Torsten Bonde Christiansen Widgetset => GTK 2
2010-11-24 15:43 Vincent Snijders LazTarget => 1.0
2010-11-24 15:43 Vincent Snijders Status new => acknowledged
2010-11-24 15:43 Vincent Snijders Target Version => 1.0.0
2010-11-24 15:51 Paul Ishenin Fixed in Revision => 28458
2010-11-24 15:51 Paul Ishenin Status acknowledged => resolved
2010-11-24 15:51 Paul Ishenin Fixed in Version => 0.9.29 (SVN)
2010-11-24 15:51 Paul Ishenin Resolution open => fixed
2010-11-24 15:51 Paul Ishenin Assigned To => Paul Ishenin
2010-11-24 15:51 Paul Ishenin Note Added: 0043477
2010-11-24 20:22 Torsten Bonde Christiansen Note Added: 0043489
2010-11-25 08:42 Torsten Bonde Christiansen Status resolved => closed