1. Ch 6 Layout Management Author: Tony

2. Absolute Positioning

The user cannot resize the window

3. Some text may be truncated

Unusually large font

4. Translate into another language The widget might have inappropriate sizes 5. The positions and sizes must be calculated manually 6. resizeEvent

Set the widgets' geometries

reserve the extra space for ensuring the user resizes the widget smoothly

7. Layout Manager

QLayout

QHBoxLayout

8. QVBoxLayout 9. QGridLayout 10. Margin & Spacing

QLayout::setContentsMargins()

11. QLayout::setSpacing() 12. QGridLayout

Add widget with matrix type

layout->addWidget(widget, row, column, rowSpan, columnSpan);

rowSpan = 1

13. columnSpan = 1 addStretch()

Excess space between close button and help button

14. QSizePolicy 15. Preferred vs. Expanding

The excess space will give to theExpandingwidgets.

16. Preferredwidgets stay at their size hint. 17. MinimumExpanding & Ignored

They are used in older version of Qt

18. Replaced by

Expanding

19. ReimplementminimumSizeHint() 20. Stretch Factor

Two factors to define the expanding rate

QSizePolicy::setHorizontalStretch ( uchar stretchFactor )

21. QSizePolicy::setVerticalStretch ( uchar stretchFactor ) 22. QStackedLayout

Show the one of a set of

Child widgets

23. Pages The pages are numbered from 0 24. Make a specific child widget visible

setCurrentIndex()

25. An Example of Preferences Dialog QListWidget QStackedLayout 26. Splitters

Qsplitter class

27. Contain other widgets 28. Automatically placed side by side in the order in which they are created 29. An Example of Splitters 30. An Example of The Mail Client's Splitter Layout 31. An Example of The Mail Client's Splitter Layout (cont.)

User resizes a window, Qsplitter normally distributes the space

setStretchFactor()

32. Scrolling Areas

Simpler to use (comparison with QscrollBars)

33. Call setWidget() member function 34. setWidgetResizable() 35. ScrollBarPolicy

setHorizontalScrollBarPolicy()

36. setVerticalScrollBarPolicy() 37. 38. Dock Windows 39. Dock Windows (cont.) 40. Dock Windows (cont.)

QDockWidget class

41. SetFeatures()

movable, closable, and floatable

setAllowedAreas() 42. QMainWindow::setCorner() 43. Save the states

QMainWindow::saveState()

44. QMainWindow::restoreState() 45. Dock Windows (cont.) 46. Tool Bar 47. Tool Bar (cont.) 48. Tool Bar (cont.) 49. Multiple Documemt Interface (MDI) 50. MDI (cont.)

QMidArea class

Create it and make it central

51. MDI (cont.) 52. Qt-specific Command-Line Options

Options

style

motif, windows, and platinum

font 53. graphicssystem

raster, opengl

Arguments

QApplication::arguments()

54. Qt-specific Command-Line Options 55. Add a New Sub-window 56. Other Sub-window Operations

closeActiveSubWindow()

57. closeAllSubWindow() 58. tileSubWindow() 59. cascadeSubWindow()