February 2008
Intermediate to advanced
752 pages
19h 5m
English
Content preview from C++ GUI Programming with Qt 4Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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7. Event Processing
- Reimplementing Event Handlers
- Installing Event Filters
- Staying Responsive during Intensive Processing
Events are generated by the window system or by Qt itself in response to various occurrences. When the user presses or releases a key or mouse button, a key or mouse event is generated; when a window is shown for the first time, a paint event is generated to tell the newly visible window that it needs to draw itself. Most events are generated in response to user actions, but some, such as timer events, are generated independently by the system.
When we program with Qt, we seldom need to think about events, because Qt widgets ...