SizeGripItem is a size grip QGraphicsItem for interactively resizing
other QGraphicsItem objects. It draws a size grip with 8 interactive
handles around its parent so that it can be interactively resized.
There is no installation procedure. To use SizeGripItem in your own project,
just copy the SizeGripItem.h and SizeGripItem.cpp files and add them to
your build.
SizeGripItem is designed to resize its parent item. You add a SizeGripItem
to another QGraphicsItem simply by setting that item to be the
SizeGripItem's parent.
When you create a new SizeGripItem, you must pass its constructor a pointer
to an instance of a subclass of the SizeGripItem::Resizer class.
SizeGripItem::Resizer is an abstract class with a pure virtual operator()
with the following signature:
void operator()(QGraphicsItem* item, const QRectF& rect)A subclass of SizeGripItem::Resizer must implement operator() with the
signature above so that item is resized to fit rect when a call to the
operator is made. rect corresponds to the rectangle described by the
SizeGripItem's handles and its coordinates are in the SizeGripItem's
coordinate system.
SizeGripItem instances take ownership of the SizeGripItem::Resizer pointer
passed to them on construction, which means that pointer is deleted when
the SizeGripItem is destroyed.
The demo/ directory provides example code for using SizeGripItem. You can
build and run the demo using CMake >=2.8.0 as follows (assuming you are
at the project's root directory):
$ mkdir build
$ cd build
$ cmake ..
$ make
$ ./demo/sizegripitemdemo
SizeGripItem is under the MIT license. See LICENSE for details.