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The Q3Header class provides a header row or column, e.g. for tables and listviews. More...
#include <Q3Header>
This class is part of the Qt 3 support library. It is provided to keep old source code working. We strongly advise against using it in new code. See Porting to Qt 4 for more information.
Inherits QWidget.
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The Q3Header class provides a header row or column, e.g. for tables and listviews.
This class provides a header, e.g. a vertical header to display row labels, or a horizontal header to display column labels. It is used by Q3Table and Q3ListView for example.
A header is composed of one or more sections, each of which can display a text label and an icon. A sort indicator (an arrow) can also be displayed using setSortIndicator().
Sections are added with addLabel() and removed with removeLabel(). The label and icon are set in addLabel() and can be changed later with setLabel(). Use count() to retrieve the number of sections in the header.
The orientation of the header is set with setOrientation(). If setStretchEnabled() is true, the sections will expand to take up the full width (height for vertical headers) of the header. The user can resize the sections manually if setResizeEnabled() is true. Call adjustHeaderSize() to have the sections resize to occupy the full width (or height).
A section can be moved with moveSection(). If setMovingEnabled() is true (the default)the user may drag a section from one position to another. If a section is moved, the index positions at which sections were added (with addLabel()), may not be the same after the move. You don't have to worry about this in practice because the Q3Header API works in terms of section numbers, so it doesn't matter where a particular section has been moved to.
If you want the current index position of a section call mapToIndex() giving it the section number. (This is the number returned by the addLabel() call which created the section.) If you want to get the section number of a section at a particular index position call mapToSection() giving it the index number.
Here's an example to clarify mapToSection() and mapToIndex():
| Index positions | |||
|---|---|---|---|
| 0 | 1 | 2 | 3 |
| Original section ordering | |||
| Sect 0 | Sect 1 | Sect 2 | Sect 3 |
| Ordering after the user moves a section | |||
| Sect 0 | Sect 2 | Sect 3 | Sect 1 |
| k | mapToSection(k) | mapToIndex(k) |
|---|---|---|
| 0 | 0 | 0 |
| 1 | 2 | 3 |
| 2 | 3 | 1 |
| 3 | 1 | 2 |
In the example above, if we wanted to find out which section is at index position 3 we'd call mapToSection(3) and get a section number of 1 since section 1 was moved. Similarly, if we wanted to know which index position section 2 occupied we'd call mapToIndex(2) and get an index of 1.
Q3Header provides the clicked(), pressed() and released() signals. If the user changes the size of a section, the sizeChange() signal is emitted. If you want to have a sizeChange() signal emitted continuously whilst the user is resizing (rather than just after the resizing is finished), use setTracking(). If the user moves a section the indexChange() signal is emitted.
See also Q3ListView and Q3Table.
This property holds the number of sections in the header.
Access functions:
This property holds whether the header sections can be moved.
If this property is true (the default) the user can move sections. If the user moves a section the indexChange() signal is emitted.
Access functions:
See also setClickEnabled() and setResizeEnabled().
This property holds the header's left-most (or top-most) visible pixel.
Setting this property will scroll the header so that offset becomes the left-most (or top-most for vertical headers) visible pixel.
Access functions:
This property holds the header's orientation.
The orientation is either Qt::Vertical or Qt::Horizontal (the default).
Call setOrientation() before adding labels if you don't provide a size parameter otherwise the sizes will be incorrect.
Access functions:
This property holds whether the header sections always take up the full width (or height) of the header.
Access functions:
This property holds whether the sizeChange() signal is emitted continuously.
If tracking is on, the sizeChange() signal is emitted continuously while the mouse is moved (i.e. when the header is resized), otherwise it is only emitted when the mouse button is released at the end of resizing.
Tracking defaults to false.
Access functions:
Constructs a horizontal header called name, with parent parent.
Constructs a horizontal header called name, with n sections and parent parent.
Destroys the header and all its sections.
Adds a new section with label text s. Returns the index position where the section was added (at the right for horizontal headers, at the bottom for vertical headers). The section's width is set to size. If size < 0, an appropriate size for the text s is chosen.
This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
Adds a new section with icon icon and label text s. Returns the index position where the section was added (at the right for horizontal headers, at the bottom for vertical headers). The section's width is set to size, unless size is negative in which case the size is calculated taking account of the size of the text.
Adjusts the size of the sections to fit the size of the header as completely as possible. Only sections for which isStretchEnabled() is true will be resized.
Use sectionAt() instead.
Returns the index at which the section is displayed, which contains pos in widget coordinates, or -1 if pos is outside the header sections.
Use sectionPos() instead.
Returns the position in pixels of the section that is displayed at the index i. The position is measured from the start of the header.
Use sectionSize() instead.
Returns the size in pixels of the section that is displayed at the index i.
See also setCellSize().
If isClickEnabled() is true, this signal is emitted when the user clicks section section.
See also pressed() and released().
Returns the total width of all the header columns.
Returns the icon set for section section. If the section does not exist, 0 is returned.
This signal is emitted when the user moves section section from index position fromIndex, to index position toIndex.
Returns true if section section is clickable; otherwise returns false.
If section is out of range (negative or larger than count() - 1): returns true if all sections are clickable; otherwise returns false.
See also setClickEnabled().
Returns true if section section is resizeable; otherwise returns false.
If section is -1 then this function applies to all sections, i.e. returns true if all sections are resizeable; otherwise returns false.
See also setResizeEnabled().
Returns the text for section section. If the section does not exist, returns an empty string.
See also setLabel().
Use mapToIndex() instead.
Translates from logical index l to actual index (index at which the section l is displayed) . Returns -1 if l is outside the legal range.
See also mapToLogical().
Returns the index position at which section section is displayed.
Use mapToSection() instead.
Translates from actual index a (index at which the section is displayed) to logical index of the section. Returns -1 if a is outside the legal range.
See also mapToActual().
Returns the number of the section that is displayed at index position index.
Use moveSection() instead.
Moves the section that is currently displayed at index fromIdx to index toIdx.
Moves section section to index position toIndex.
Use indexChange() instead.
This signal is emitted when the user has moved the section which is displayed at the index fromIndex to the index toIndex.
Paints the section at position index, inside rectangle fr (which uses widget coordinates) using painter p.
Calls paintSectionLabel().
Paints the label of the section at position index, inside rectangle fr (which uses widget coordinates) using painter p.
Called by paintSection()
This signal is emitted when the user presses section section down.
See also released().
This signal is emitted when section section is released.
See also pressed().
Removes section section. If the section does not exist, nothing happens.
Resizes section section to s pixels wide (or high).
Returns the rectangle covered by the section at index index.
Returns the index of the section which contains the position pos given in pixels from the left (or top).
See also offset().
Use clicked() instead.
This signal is emitted when a part of the header is clicked. index is the index at which the section is displayed.
In a list view this signal would typically be connected to a slot that sorts the specified column (or row).
This signal is emitted when the user doubleclicks on the edge (handle) of section section.
Returns the position (in pixels) at which the section starts.
See also offset().
Returns the rectangle covered by section section.
Returns the width (or height) of the section in pixels.
Use resizeSection() instead.
Sets the size of the section section to s pixels.
Warning: does not repaint or send out signals
See also cellSize().
If enable is true, any clicks on section section will result in clicked() signals being emitted; otherwise the section will ignore clicks.
If section is -1 (the default) then the enable value is set for all existing sections and will be applied to any new sections that are added.
See also isClickEnabled(), setMovingEnabled(), and setResizeEnabled().
Sets the text of section section to s. The section's width is set to size if size >= 0; otherwise it is left unchanged. Any icon set that has been set for this section remains unchanged.
If the section does not exist, nothing happens.
See also label().
This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
Sets the icon for section section to icon and the text to s. The section's width is set to size if size >= 0; otherwise it is left unchanged.
If the section does not exist, nothing happens.
If enable is true the user may resize section section; otherwise the section may not be manually resized.
If section is negative (the default) then the enable value is set for all existing sections and will be applied to any new sections that are added. Example:
// Allow resizing of all current and future sections
header->setResizeEnabled(true);
// Disable resizing of section 3, (the fourth section added)
header->setResizeEnabled(false, 3);
If the user resizes a section, a sizeChange() signal is emitted.
See also isResizeEnabled(), setMovingEnabled(), setClickEnabled(), and setTracking().
Sets a sort indicator onto the specified section. The indicator's order is either Ascending or Descending.
Only one section can show a sort indicator at any one time. If you don't want any section to show a sort indicator pass a section number of -1.
See also sortIndicatorSection() and sortIndicatorOrder().
This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
Sets the sort indicator to ascending. Use the other overload instead.
This signal is emitted when the user has changed the size of a section from oldSize to newSize. This signal is typically connected to a slot that repaints the table or list that contains the header.
Returns the implied sort order of the Q3Headers sort indicator.
See also setSortIndicator() and sortIndicatorSection().
Returns the section showing the sort indicator or -1 if there is no sort indicator.
See also setSortIndicator() and sortIndicatorOrder().
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