Uploaded image for project: 'Qt'
  1. Qt
  2. QTBUG-38768

When a widget is programatically resized then it will trigger a spontaneous event even though the event did not originate from the system

    XMLWordPrintable

Details

    • Bug
    • Resolution: Done
    • P2: Important
    • 5.3.1, 5.4.0
    • 5.3.0 Beta1
    • GUI: Window management
    • None
    • c3e416296a1026d7ba99cf209f5e0720ff5050b1 (6.6.2014, stable, 5.3.1?), a1c5198387fdb7db44a02bb94c56187874e67304 6.6.2014, stable, 5.3.1?) Reverted 5da108a4a76b163116f1b816090075a9b86cf077 9c80a3be4b3beb28a3a6bda717c15b0ded523557 (5.3, 13.6.2014)

    Description

      Description

      When a widget is programmatically resized then it will trigger a spontaneous event even though the event did not originate from the system. Attached is an example that reproduces this by way of a timer using addWidget() on a layout.

      Changes:

      Approach 1: Do not programmatically generate resize, wait for platform event

      Approach 2: Detect non-spontaneous by checking whether geometry is already correct, suppress platform events in that case

      Approach 3: Suppress non-spontaneous events in the QPA plugins.

      --> Deferred, breaks a lot of tests, initial resize goes missing.

      Approach 4: Let the QPA plugins determine spontaneity

      Attachments

        1. main.cpp
          0.7 kB
        2. qtbug38768.zip
          1 kB

        Issue Links

          relates to

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-32590 two move events per move call, one in subsequent message loop

          • P2: Important - Urgent, should be fixed, but will not stop the release.
          • Closed

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-30744 QWidget receives two resizeEvent's before its first paintEvent

          • P3: Somewhat important - Should be fixed, but doesn't affect the release in any way.
          • Closed
          replaces

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-29937 [REG]: A QGLWidget in a top level widget gets two resize events when programatically resized

          • P2: Important - Urgent, should be fixed, but will not stop the release.
          • Closed
          resulted in

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-39611 Regression/Windows: QWizard buttons wrongly positioned on branch 5.3 after merge from stable (5.3.0 release tags)

          • P1: Critical - Urgent and Important, will STOP the release if matched with set FixVersion field. This includes regressions from the last version that are not edge cases; Data loss; Build issues; All but the most unlikely crashes/lockups/hanging; Serious usability issues and embarrassing bugs & Bugs critical to a deliverable. This is the highest possible priority for requirements.
          • Closed
          For Gerrit Dashboard: QTBUG-38768
          # Subject Branch Project Status CR V
          85474,3 Suppress synthesized resize event when programmatically resizing native widgets. stable qt/qtbase Status: DEFERRED 0 0
          85475,3 Set QEvent::spontaneous correctly in move/resize event handling. stable qt/qtbase Status: DEFERRED +2 0
          86224,3 Suppress move/resize events if they are the result of call to move()/resize(). stable qt/qtbase Status: MERGED +2 0
          87417,10 Introduce spontaneity to QWindowSystemInterface::WindowSystemEvent. dev qt/qtbase Status: DEFERRED -1 0
          89059,1 WIP: Fix spontaneity. dev qt/qtbase Status: DEFERRED 0 0
          90531,4 Introduce flags to QWindowSystemInterface::WindowSystemEvent. dev qt/qtbase Status: MERGED +2 0
          97822,17 Fix too many resizes and move events for native widgets 5.4 qt/qtbase Status: MERGED +2 0
          98851,1 Fix too many resizes and move events for native widgets 5.4.0 qt/qtbase Status: ABANDONED 0 0

          Activity

            People

              jolind Jorgen Lind
              andysh Andy Shaw
              Votes:
              2 Vote for this issue
              Watchers:
              8 Start watching this issue

              Dates

                Created:
                Updated:
                Resolved: