The Q3IconViewItem class provides a single item in a Q3IconView . 更多...
| 头： | #include <Q3IconViewItem> |
| Q3IconViewItem (Q3IconView * parent ) | |
| Q3IconViewItem (Q3IconView * parent , Q3IconViewItem * after ) | |
| Q3IconViewItem (Q3IconView * parent , const QString & text ) | |
| Q3IconViewItem (Q3IconView * parent , Q3IconViewItem * after , const QString & text ) | |
| Q3IconViewItem (Q3IconView * parent , const QString & text , const QPixmap & icon ) | |
| Q3IconViewItem (Q3IconView * parent , Q3IconViewItem * after , const QString & text , const QPixmap & icon ) | |
| Q3IconViewItem (Q3IconView * parent , const QString & text , const QPicture & picture ) | |
| Q3IconViewItem (Q3IconView * parent , Q3IconViewItem * after , const QString & text , const QPicture & picture ) | |
| virtual | ~Q3IconViewItem () |
| virtual bool | acceptDrop (const QMimeSource * mime ) const |
| virtual int | compare (Q3IconViewItem * i ) const |
| bool | contains (const QPoint & pnt ) const |
| bool | dragEnabled () const |
| bool | dropEnabled () const |
| int | height () const |
| Q3IconView * | iconView () const |
| int | index () const |
| bool | intersects (const QRect & r ) const |
| bool | isSelectable () const |
| bool | isSelected () const |
| virtual QString | key () const |
| virtual bool | move (int x , int y ) |
| virtual bool | move (const QPoint & pnt ) |
| virtual void | moveBy (int dx , int dy ) |
| virtual void | moveBy (const QPoint & pnt ) |
| Q3IconViewItem * | nextItem () const |
| virtual QPicture * | picture () const |
| virtual QPixmap * | pixmap () const |
| QRect | pixmapRect (bool relative = true) const |
| QPoint | pos () const |
| Q3IconViewItem * | prevItem () const |
| QRect | rect () const |
| void | rename () |
| bool | renameEnabled () const |
| virtual void | repaint () |
| virtual int | rtti () const |
| virtual void | setDragEnabled (bool allow ) |
| virtual void | setDropEnabled (bool allow ) |
| virtual void | setKey (const QString & k ) |
| virtual void | setPicture (const QPicture & icon ) |
| virtual void | setPixmap (const QPixmap & icon ) |
| virtual void | setPixmap (const QPixmap & icon , bool recalc , bool redraw = true) |
| virtual void | setRenameEnabled (bool allow ) |
| virtual void | setSelectable (bool enable ) |
| virtual void | setSelected (bool s , bool cb ) |
| virtual void | setSelected (bool s ) |
| virtual void | setText (const QString & text ) |
| virtual void | setText (const QString & text , bool recalc , bool redraw = true) |
| QSize | size () const |
| virtual QString | text () const |
| QRect | textRect (bool relative = true) const |
| int | width () const |
| int | x () const |
| int | y () const |
| virtual void | calcRect (const QString & text_ = QString()) |
| virtual void | dragEntered () |
| virtual void | dragLeft () |
| virtual void | dropped (QDropEvent * e , const Q3ValueList<Q3IconDragItem> & lst ) |
| virtual void | paintFocus (QPainter * p , const QColorGroup & cg ) |
| virtual void | paintItem (QPainter * p , const QColorGroup & cg ) |
| virtual void | removeRenameBox () |
| void | setItemRect (const QRect & r ) |
| void | setPixmapRect (const QRect & r ) |
| void | setTextRect (const QRect & r ) |
The Q3IconViewItem class provides a single item in a Q3IconView .
A Q3IconViewItem contains an icon, a string and optionally a sort key, and can display itself in a Q3IconView .
The simplest way to create a Q3IconViewItem and insert it into a Q3IconView is to construct the item passing the constructor a pointer to the icon view, a string and an icon:
(void) new Q3IconViewItem( iconView, // A pointer to a Q3IconView "This is the text of the item", aPixmap);
By default the text of an icon view item may not be edited by the user but calling setRenameEnabled (true) will allow the user to perform in-place editing of the item's text.
When the icon view is deleted all items in it are deleted automatically.
The Q3IconView::firstItem () 和 Q3IconViewItem::nextItem () functions provide a means of iterating over all the items in a Q3IconView :
Q3IconViewItem *item; for (item = iconView->firstItem(); item; item = item->nextItem()) do_something_with(item);
The item's icon view is available from iconView (), and its position in the icon view from index ().
The item's selection status is available from isSelected () and is set and controlled by setSelected () 和 isSelectable ().
The text and icon can be set with setText () 和 setPixmap () 和检索采用 text () 和 pixmap (). The item's sort key defaults to text () but may be set with setKey () 和检索采用 key (). The comparison function, compare () uses key ().
Items may be repositioned with move () 和 moveBy (). An item's geometry is available from rect (), x (), y (), width (), height (), size (), pos (), textRect () 和 pixmapRect (). You can also test against the position of a point with contains () 和 intersects ().
To remove an item from an icon view, just delete the item. The Q3IconViewItem destructor removes it cleanly from its icon view.
Because the icon view is designed to use drag-and-drop, the icon view item also has functions for drag-and-drop which may be reimplemented.
The class is designed to be very similar to Q3ListView and Q3ListBox in use, both via instantiation and subclassing.
构造 Q3IconViewItem and inserts it into icon view parent with no text and a default icon.
构造 Q3IconViewItem and inserts it into the icon view parent with no text and a default icon, after the icon view item after .
Constructs an icon view item and inserts it into the icon view parent 使用 text as the text and a default icon.
Constructs an icon view item and inserts it into the icon view parent 使用 text as the text and a default icon, after the icon view item after .
Constructs an icon view item and inserts it into the icon view parent 使用 text as the text and icon as the icon.
Constructs an icon view item and inserts it into the icon view parent 使用 text as the text and icon as the icon, after the icon view item after .
Constructs an icon view item and inserts it into the icon view parent 使用 text as the text and picture as the icon.
Constructs an icon view item and inserts it into the icon view parent 使用 text as the text and picture as the icon, after the icon view item after .
[虚拟]
Q3IconViewItem::
~Q3IconViewItem
()
Destroys the icon view item and tells the parent icon view that the item has been destroyed.
[虚拟]
bool
Q3IconViewItem::
acceptDrop
(const
QMimeSource
*
mime
) const
Returns true if you can drop things with a QMimeSource of mime onto this item; otherwise returns false.
The default implementation always returns false. You must subclass Q3IconViewItem and reimplement acceptDrop() to accept drops.
[virtual protected]
void
Q3IconViewItem::
calcRect
(const
QString
&
text_
= QString())
This virtual function is responsible for calculating the rectangles returned by rect (), textRect () 和 pixmapRect (). setRect(), setTextRect () 和 setPixmapRect () are provided mainly for reimplementations of this function.
text_ is an internal parameter which defaults to an empty string.
[虚拟]
int
Q3IconViewItem::
compare
(
Q3IconViewItem
*
i
) const
Compares this icon view item to i . Returns -1 if this item is less than i , 0 if they are equal, and 1 if this icon view item is greater than i .
The default implementation compares the item keys ( key ()) using QString::localeAwareCompare (). A reimplementation may use different values and a different comparison function. Here is a reimplementation that uses plain Unicode comparison:
int MyIconViewItem::compare(Q3IconViewItem *i) const { return key().compare(i->key()); }
另请参阅 key (), QString::localeAwareCompare ()，和 QString::compare ().
Returns true if the item contains the point pnt (in contents coordinates); otherwise returns false.
Returns true if the user is allowed to drag the icon view item; otherwise returns false.
另请参阅 setDragEnabled ().
[virtual protected]
void
Q3IconViewItem::
dragEntered
()
This function is called when a drag enters the item's bounding rectangle.
The default implementation does nothing; subclasses may reimplement this function.
[virtual protected]
void
Q3IconViewItem::
dragLeft
()
This function is called when a drag leaves the item's bounding rectangle.
The default implementation does nothing; subclasses may reimplement this function.
Returns true if the user is allowed to drop something onto the item; otherwise returns false.
另请参阅 setDropEnabled ().
[virtual protected]
void
Q3IconViewItem::
dropped
(
QDropEvent
*
e
, const
Q3ValueList
<
Q3IconDragItem
> &
lst
)
This function is called when something is dropped on the item. e provides all the information about the drop. If the drag object of the drop was a Q3IconDrag , lst contains the list of the dropped items. You can get the data by calling Q3IconDragItem::data () on each item. If the lst is empty, i.e. the drag was not a Q3IconDrag , you must decode the data in e and work with that.
The default implementation does nothing; subclasses may reimplement this function.
Returns the height of the item.
Returns a pointer to this item's icon view parent.
Returns the index of this item in the icon view, or -1 if an error occurred.
Returns true if the item intersects the rectangle r (in contents coordinates); otherwise returns false.
Returns true if the item is selectable; otherwise returns false.
另请参阅 setSelectable ().
Returns true if the item is selected; otherwise returns false.
另请参阅 setSelected ().
[虚拟]
QString
Q3IconViewItem::
key
() const
Returns the key of the icon view item or text () if no key has been explicitly set.
[虚拟]
bool
Q3IconViewItem::
move
(
int
x
,
int
y
)
Moves the item to position ( x , y ) in the icon view (these are contents coordinates). Returns true if the item is moved. Returns false if the item is already at the specified position.
[虚拟]
bool
Q3IconViewItem::
move
(const
QPoint
&
pnt
)
这是重载函数。
Moves the item to the point pnt .
[虚拟]
void
Q3IconViewItem::
moveBy
(
int
dx
,
int
dy
)
Moves the item dx pixels in the x-direction and dy pixels in the y-direction.
[虚拟]
void
Q3IconViewItem::
moveBy
(const
QPoint
&
pnt
)
这是重载函数。
Moves the item by the x, y values in point pnt .
Returns a pointer to the next item, or 0 if this is the last item in the icon view.
To find the first item use Q3IconView::firstItem ().
范例：
Q3IconViewItem *item; for (item = iconView->firstItem(); item; item = item->nextItem()) do_something_with(item);
另请参阅 prevItem ().
[virtual protected]
void
Q3IconViewItem::
paintFocus
(
QPainter
*
p
, const
QColorGroup
&
cg
)
Paints the focus rectangle of the item using the painter p and the color group cg .
[virtual protected]
void
Q3IconViewItem::
paintItem
(
QPainter
*
p
, const
QColorGroup
&
cg
)
Paints the item using the painter p and the color group cg . If you want the item to be drawn with a different font or color, reimplement this function, change the values of the color group or the painter's font, and then call the Q3IconViewItem::paintItem() with the changed values.
[虚拟]
QPicture
* Q3IconViewItem::
picture
() const
Returns the icon of the icon view item if it is a picture, or 0 if it is a pixmap. In the latter case use pixmap () instead. Normally you set the picture of the item with setPicture (), but sometimes it's inconvenient to call setPicture () for every item. So you can subclass Q3IconViewItem , reimplement this function and return a pointer to the item's picture. If you do this, you must call calcRect () manually each time the size of this picture changes.
另请参阅 setPicture ().
[虚拟]
QPixmap
* Q3IconViewItem::
pixmap
() const
Returns the icon of the icon view item if it is a pixmap, or 0 if it is a picture. In the latter case use picture () instead. Normally you set the pixmap of the item with setPixmap (), but sometimes it's inconvenient to call setPixmap () for every item. So you can subclass Q3IconViewItem , reimplement this function and return a pointer to the item's pixmap. If you do this, you must call calcRect () manually each time the size of this pixmap changes.
另请参阅 setPixmap ().
Returns the bounding rectangle of the item's icon.
若 relative is true, (the default), the rectangle is relative to the origin of the item's rectangle. If relative is false, the returned rectangle is relative to the origin of the icon view's contents coordinate system.
另请参阅 setPixmapRect ().
Returns the position of the item (in contents coordinates).
Returns a pointer to the previous item, or 0 if this is the first item in the icon view.
另请参阅 nextItem () 和 Q3IconView::firstItem ().
Returns the bounding rectangle of the item (in contents coordinates).
[virtual protected]
void
Q3IconViewItem::
removeRenameBox
()
Removes the editbox that is used for in-place renaming.
Starts in-place renaming of an icon, if allowed.
This function sets up the icon view so that the user can edit the item text, and then returns. When the user is done, setText () will be called and Q3IconView::itemRenamed () will be emitted (unless the user canceled, e.g. by pressing the Escape key).
另请参阅 setRenameEnabled ().
Returns true if the item can be renamed by the user with in-place renaming; otherwise returns false.
另请参阅 setRenameEnabled ().
[虚拟]
void
Q3IconViewItem::
repaint
()
Repaints the item.
[虚拟]
int
Q3IconViewItem::
rtti
() const
Returns 0.
Make your derived classes return their own values for rtti(), so that you can distinguish between icon view item types. You should use values greater than 1000, preferably a large random number, to allow for extensions to this class.
[虚拟]
void
Q3IconViewItem::
setDragEnabled
(
bool
allow
)
若 allow is true, the icon view permits the user to drag the icon view item either to another position within the icon view or to somewhere outside of it. If allow is false, the item cannot be dragged.
另请参阅 dragEnabled ().
[虚拟]
void
Q3IconViewItem::
setDropEnabled
(
bool
allow
)
若 allow is true, the icon view lets the user drop something on this icon view item.
另请参阅 dropEnabled ().
[protected]
void
Q3IconViewItem::
setItemRect
(const
QRect
&
r
)
Sets the bounding rectangle of the whole item to r . This function is provided for subclasses which reimplement calcRect (), so that they can set the calculated rectangle. Any other use is discouraged.
另请参阅 calcRect (), textRect (), setTextRect (), pixmapRect ()，和 setPixmapRect ().
[虚拟]
void
Q3IconViewItem::
setKey
(const
QString
&
k
)
集 k as the sort key of the icon view item. By default text () is used for sorting.
[虚拟]
void
Q3IconViewItem::
setPicture
(const
QPicture
&
icon
)
集 icon as the item's icon in the icon view. This function might be a no-op if you reimplement picture ().
另请参阅 picture ().
[虚拟]
void
Q3IconViewItem::
setPixmap
(const
QPixmap
&
icon
)
集 icon as the item's icon in the icon view. This function might be a no-op if you reimplement pixmap ().
另请参阅 pixmap ().
[虚拟]
void
Q3IconViewItem::
setPixmap
(const
QPixmap
&
icon
,
bool
recalc
,
bool
redraw
= true)
这是重载函数。
集 icon as the item's icon in the icon view. If recalc is true, the icon view's layout is recalculated. If redraw is true (the default), the icon view is repainted.
另请参阅 pixmap ().
[protected]
void
Q3IconViewItem::
setPixmapRect
(const
QRect
&
r
)
Sets the bounding rectangle of the item's icon to r . This function is provided for subclasses which reimplement calcRect (), so that they can set the calculated rectangle. Any other use is discouraged.
另请参阅 calcRect (), pixmapRect (), setItemRect ()，和 setTextRect ().
[虚拟]
void
Q3IconViewItem::
setRenameEnabled
(
bool
allow
)
若 allow is true, the user can rename the icon view item by clicking on the text (or pressing F2) while the item is selected (in-place renaming). If allow is false, in-place renaming is not possible.
另请参阅 renameEnabled ().
[虚拟]
void
Q3IconViewItem::
setSelectable
(
bool
enable
)
Sets this item to be selectable if enable is true (the default) or unselectable if enable 为 false。
The user is unable to select a non-selectable item using either the keyboard or the mouse. (The application programmer can select an item in code regardless of this setting.)
另请参阅 isSelectable ().
[虚拟]
void
Q3IconViewItem::
setSelected
(
bool
s
,
bool
cb
)
Selects or unselects the item, depending on s ; it may also unselect other items, depending on Q3IconView::selectionMode () 和 cb .
若 s is false, the item is unselected.
若 s is true and Q3IconView::selectionMode () 是 Q3IconView::Single , the item is selected and the item previously selected is unselected.
若 s is true and Q3IconView::selectionMode () 是 Q3IconView::Extended , the item is selected. If cb is true, the selection state of the other items is left unchanged. If cb is false (the default) all other items are unselected.
若 s is true and Q3IconView::selectionMode () 是 Q3IconView::Multi , the item is selected.
注意， cb is used only if Q3IconView::selectionMode () 是 Q3IconView::Extended ; cb defaults to false.
All items whose selection status changes repaint themselves.
另请参阅 isSelected ().
[虚拟]
void
Q3IconViewItem::
setSelected
(
bool
s
)
这是重载函数。
This variant is equivalent to calling the other variant with cb 设为 false。
[虚拟]
void
Q3IconViewItem::
setText
(const
QString
&
text
)
集 text as the text of the icon view item. This function might be a no-op if you reimplement text ().
另请参阅 text ().
[虚拟]
void
Q3IconViewItem::
setText
(const
QString
&
text
,
bool
recalc
,
bool
redraw
= true)
这是重载函数。
集 text as the text of the icon view item. If recalc is true, the icon view's layout is recalculated. If redraw is true (the default), the icon view is repainted.
另请参阅 text ().
[protected]
void
Q3IconViewItem::
setTextRect
(const
QRect
&
r
)
Sets the bounding rectangle of the item's text to r . This function is provided for subclasses which reimplement calcRect (), so that they can set the calculated rectangle. Any other use is discouraged.
另请参阅 calcRect (), textRect (), setItemRect ()，和 setPixmapRect ().
Returns the size of the item.
[虚拟]
QString
Q3IconViewItem::
text
() const
Returns the text of the icon view item. Normally you set the text of the item with setText (), but sometimes it's inconvenient to call setText () for every item; so you can subclass Q3IconViewItem , reimplement this function, and return the text of the item. If you do this, you must call calcRect () manually each time the text (and therefore its size) changes.
另请参阅 setText ().
Returns the bounding rectangle of the item's text.
若 relative is true, (the default), the returned rectangle is relative to the origin of the item's rectangle. If relative is false, the returned rectangle is relative to the origin of the icon view's contents coordinate system.
另请参阅 setTextRect ().
Returns the width of the item.
Returns the x-coordinate of the item (in contents coordinates).
Returns the y-coordinate of the item (in contents coordinates).