QRect 类

成员函数文档编制

QRect:: QRect ()

Constructs a null rectangle.

另请参阅 isNull ().

QRect:: QRect (const QPoint & topLeft , const QPoint & bottomRight )

Constructs a rectangle with the given topLeft and bottomRight corners.

另请参阅 setTopLeft () 和 setBottomRight ().

QRect:: QRect (const QPoint & topLeft , const QSize & size )

Constructs a rectangle with the given topLeft corner and the given size .

另请参阅 setTopLeft () 和 setSize ().

QRect:: QRect ( int x , int y , int width , int height )

Constructs a rectangle with ( x , y ) as its top-left corner and the given width and height .

另请参阅 setRect ().

void QRect:: adjust ( int dx1 , int dy1 , int dx2 , int dy2 )

添加 dx1 , dy1 , dx2 and dy2 respectively to the existing coordinates of the rectangle.

另请参阅 adjusted () 和 setRect ().

QRect QRect:: adjusted ( int dx1 , int dy1 , int dx2 , int dy2 ) const

Returns a new rectangle with dx1 , dy1 , dx2 and dy2 added respectively to the existing coordinates of this rectangle.

另请参阅 adjust ().

int QRect:: bottom () const

Returns the y-coordinate of the rectangle's bottom edge.

Note that for historical reasons this function returns top () + height () - 1; use y () + height () to retrieve the true y-coordinate.

另请参阅 setBottom (), bottomLeft ()，和 bottomRight ().

QPoint QRect:: bottomLeft () const

Returns the position of the rectangle's bottom-left corner. Note that for historical reasons this function returns QPoint ( left (), top () + height () - 1).

另请参阅 setBottomLeft (), bottom ()，和 left ().

QPoint QRect:: bottomRight () const

Returns the position of the rectangle's bottom-right corner.

Note that for historical reasons this function returns QPoint ( left () + width () -1, top () + height () - 1).

另请参阅 setBottomRight (), bottom ()，和 right ().

QPoint QRect:: center () const

Returns the center point of the rectangle.

另请参阅 moveCenter ().

bool QRect:: contains (const QPoint & point , bool proper = false) const

返回 true 若给定 point is inside or on the edge of the rectangle, otherwise returns false 。若 proper is true, this function only returns true 若给定 point is inside the rectangle (i.e., not on the edge).

另请参阅 intersects ().

bool QRect:: contains (const QRect & rectangle , bool proper = false) const

这是重载函数。

返回 true 若给定 rectangle is inside this rectangle. otherwise returns false 。若 proper is true, this function only returns true 若 rectangle is entirely inside this rectangle (not on the edge).

bool QRect:: contains ( int x , int y ) const

这是重载函数。

返回 true if the point ( x , y ) is inside this rectangle, otherwise returns false .

bool QRect:: contains ( int x , int y , bool proper ) const

这是重载函数。

返回 true if the point ( x , y ) is inside or on the edge of the rectangle, otherwise returns false 。若 proper is true, this function only returns true if the point is entirely inside the rectangle(not on the edge).

void QRect:: getCoords ( int * x1 , int * y1 , int * x2 , int * y2 ) const

Extracts the position of the rectangle's top-left corner to * x1 and * y1 , and the position of the bottom-right corner to * x2 and * y2 .

另请参阅 setCoords () 和 getRect ().

void QRect:: getRect ( int * x , int * y , int * width , int * height ) const

Extracts the position of the rectangle's top-left corner to * x and * y , and its dimensions to * width and * height .

另请参阅 setRect () 和 getCoords ().

int QRect:: height () const

Returns the height of the rectangle.

另请参阅 setHeight (), width ()，和 size ().

QRect QRect:: intersected (const QRect & rectangle ) const

Returns the intersection of this rectangle and the given rectangle 。注意 r.intersected(s) 相当于 r & s .

This function was introduced in Qt 4.2.

另请参阅 intersects (), united ()，和 operator&= ().

bool QRect:: intersects (const QRect & rectangle ) const

返回 true if this rectangle intersects with the given rectangle (i.e., there is at least one pixel that is within both rectangles), otherwise returns false .

The intersection rectangle can be retrieved using the intersected () 函数。

另请参阅 contains ().

bool QRect:: isEmpty () const

返回 true if the rectangle is empty, otherwise returns false .

An empty rectangle has a left () > right () 或 top () > bottom (). An empty rectangle is not valid (i.e., isEmpty() == ! isValid ()).

使用 normalized () function to retrieve a rectangle where the corners are swapped.

另请参阅 isNull (), isValid ()，和 normalized ().

bool QRect:: isNull () const

返回 true if the rectangle is a null rectangle, otherwise returns false .

A null rectangle has both the width and the height set to 0 (i.e., right () == left () - 1 and bottom () == top () - 1). A null rectangle is also empty, and hence is not valid.

另请参阅 isEmpty () 和 isValid ().

bool QRect:: isValid () const

返回 true if the rectangle is valid, otherwise returns false .

A valid rectangle has a left () <= right () 和 top () <= bottom (). Note that non-trivial operations like intersections are not defined for invalid rectangles. A valid rectangle is not empty (i.e., isValid() == ! isEmpty ()).

另请参阅 isNull (), isEmpty ()，和 normalized ().

int QRect:: left () const

Returns the x-coordinate of the rectangle's left edge. Equivalent to x ().

另请参阅 setLeft (), topLeft ()，和 bottomLeft ().

QRect QRect:: marginsAdded (const QMargins & margins ) const

Returns a rectangle grown by the margins .

This function was introduced in Qt 5.1.

另请参阅 operator+= (), marginsRemoved ()，和 operator-= ().

QRect QRect:: marginsRemoved (const QMargins & margins ) const

移除 margins from the rectangle, shrinking it.

This function was introduced in Qt 5.1.

另请参阅 marginsAdded (), operator+= ()，和 operator-= ().

void QRect:: moveBottom ( int y )

Moves the rectangle vertically, leaving the rectangle's bottom edge at the given y coordinate. The rectangle's size is unchanged.

另请参阅 bottom (), setBottom ()，和 moveTop ().

void QRect:: moveBottomLeft (const QPoint & position )

Moves the rectangle, leaving the bottom-left corner at the given position . The rectangle's size is unchanged.

另请参阅 setBottomLeft (), moveBottom ()，和 moveLeft ().

void QRect:: moveBottomRight (const QPoint & position )

Moves the rectangle, leaving the bottom-right corner at the given position . The rectangle's size is unchanged.

另请参阅 setBottomRight (), moveRight ()，和 moveBottom ().

void QRect:: moveCenter (const QPoint & position )

Moves the rectangle, leaving the center point at the given position . The rectangle's size is unchanged.

另请参阅 center ().

void QRect:: moveLeft ( int x )

Moves the rectangle horizontally, leaving the rectangle's left edge at the given x coordinate. The rectangle's size is unchanged.

另请参阅 left (), setLeft ()，和 moveRight ().

void QRect:: moveRight ( int x )

Moves the rectangle horizontally, leaving the rectangle's right edge at the given x coordinate. The rectangle's size is unchanged.

另请参阅 right (), setRight ()，和 moveLeft ().

void QRect:: moveTo ( int x , int y )

Moves the rectangle, leaving the top-left corner at the given position ( x , y ). The rectangle's size is unchanged.

另请参阅 translate () 和 moveTopLeft ().

void QRect:: moveTo (const QPoint & position )

Moves the rectangle, leaving the top-left corner at the given position .

void QRect:: moveTop ( int y )

Moves the rectangle vertically, leaving the rectangle's top edge at the given y coordinate. The rectangle's size is unchanged.

另请参阅 top (), setTop ()，和 moveBottom ().

void QRect:: moveTopLeft (const QPoint & position )

Moves the rectangle, leaving the top-left corner at the given position . The rectangle's size is unchanged.

另请参阅 setTopLeft (), moveTop ()，和 moveLeft ().

void QRect:: moveTopRight (const QPoint & position )

Moves the rectangle, leaving the top-right corner at the given position . The rectangle's size is unchanged.

另请参阅 setTopRight (), moveTop ()，和 moveRight ().

QRect QRect:: normalized () const

Returns a normalized rectangle; i.e., a rectangle that has a non-negative width and height.

若 width () < 0 the function swaps the left and right corners, and it swaps the top and bottom corners if height () < 0.

另请参阅 isValid () 和 isEmpty ().

int QRect:: right () const

Returns the x-coordinate of the rectangle's right edge.

Note that for historical reasons this function returns left () + width () - 1; use x () + width () to retrieve the true x-coordinate.

另请参阅 setRight (), topRight ()，和 bottomRight ().

void QRect:: setBottom ( int y )

Sets the bottom edge of the rectangle to the given y coordinate. May change the height, but will never change the top edge of the rectangle.

另请参阅 bottom () 和 moveBottom ().

void QRect:: setBottomLeft (const QPoint & position )

Set the bottom-left corner of the rectangle to the given position . May change the size, but will never change the top-right corner of the rectangle.

另请参阅 bottomLeft () 和 moveBottomLeft ().

void QRect:: setBottomRight (const QPoint & position )

Set the bottom-right corner of the rectangle to the given position . May change the size, but will never change the top-left corner of the rectangle.

另请参阅 bottomRight () 和 moveBottomRight ().

void QRect:: setCoords ( int x1 , int y1 , int x2 , int y2 )

Sets the coordinates of the rectangle's top-left corner to ( x1 , y1 ), and the coordinates of its bottom-right corner to ( x2 , y2 ).

另请参阅 getCoords () 和 setRect ().

void QRect:: setHeight ( int height )

Sets the height of the rectangle to the given height . The bottom edge is changed, but not the top one.

另请参阅 height () 和 setSize ().

void QRect:: setLeft ( int x )

Sets the left edge of the rectangle to the given x coordinate. May change the width, but will never change the right edge of the rectangle.

相当于 setX ().

另请参阅 left () 和 moveLeft ().

void QRect:: setRect ( int x , int y , int width , int height )

Sets the coordinates of the rectangle's top-left corner to ( x , y ), and its size to the given width and height .

另请参阅 getRect () 和 setCoords ().

void QRect:: setRight ( int x )

Sets the right edge of the rectangle to the given x coordinate. May change the width, but will never change the left edge of the rectangle.

另请参阅 right () 和 moveRight ().

void QRect:: setSize (const QSize & size )

Sets the size of the rectangle to the given size . The top-left corner is not moved.

另请参阅 size (), setWidth ()，和 setHeight ().

void QRect:: setTop ( int y )

Sets the top edge of the rectangle to the given y coordinate. May change the height, but will never change the bottom edge of the rectangle.

相当于 setY ().

另请参阅 top () 和 moveTop ().

void QRect:: setTopLeft (const QPoint & position )

Set the top-left corner of the rectangle to the given position . May change the size, but will never change the bottom-right corner of the rectangle.

另请参阅 topLeft () 和 moveTopLeft ().

void QRect:: setTopRight (const QPoint & position )

Set the top-right corner of the rectangle to the given position . May change the size, but will never change the bottom-left corner of the rectangle.

另请参阅 topRight () 和 moveTopRight ().

void QRect:: setWidth ( int width )

Sets the width of the rectangle to the given width . The right edge is changed, but not the left one.

另请参阅 width () 和 setSize ().

void QRect:: setX ( int x )

Sets the left edge of the rectangle to the given x coordinate. May change the width, but will never change the right edge of the rectangle.

相当于 setLeft ().

另请参阅 x (), setY ()，和 setTopLeft ().

void QRect:: setY ( int y )

Sets the top edge of the rectangle to the given y coordinate. May change the height, but will never change the bottom edge of the rectangle.

相当于 setTop ().

另请参阅 y (), setX ()，和 setTopLeft ().

QSize QRect:: size () const

Returns the size of the rectangle.

另请参阅 setSize (), width ()，和 height ().

CGRect QRect:: toCGRect () const

Creates a CGRect from a QRect .

This function was introduced in Qt 5.8.

另请参阅 QRectF::fromCGRect ().

int QRect:: top () const

Returns the y-coordinate of the rectangle's top edge. Equivalent to y ().

另请参阅 setTop (), topLeft ()，和 topRight ().

QPoint QRect:: topLeft () const

Returns the position of the rectangle's top-left corner.

另请参阅 setTopLeft (), top ()，和 left ().

QPoint QRect:: topRight () const

Returns the position of the rectangle's top-right corner.

Note that for historical reasons this function returns QPoint ( left () + width () -1, top ()).

另请参阅 setTopRight (), top ()，和 right ().

void QRect:: translate ( int dx , int dy )

Moves the rectangle dx along the x axis and dy along the y axis, relative to the current position. Positive values move the rectangle to the right and down.

另请参阅 moveTopLeft (), moveTo ()，和 translated ().

void QRect:: translate (const QPoint & offset )

这是重载函数。

Moves the rectangle offset . x() along the x axis and offset . y() along the y axis, relative to the current position.

QRect QRect:: translated ( int dx , int dy ) const

Returns a copy of the rectangle that is translated dx along the x axis and dy along the y axis, relative to the current position. Positive values move the rectangle to the right and down.

另请参阅 translate ().

QRect QRect:: translated (const QPoint & offset ) const

这是重载函数。

Returns a copy of the rectangle that is translated offset . x() along the x axis and offset . y() along the y axis, relative to the current position.

QRect QRect:: transposed () const

Returns a copy of the rectangle that has its width and height exchanged:

QRect r = {15, 51, 42, 24};
r = r.transposed(); // r == {15, 51, 24, 42}
							

This function was introduced in Qt 5.7.

另请参阅 QSize::transposed ().

QRect QRect:: united (const QRect & rectangle ) const

Returns the bounding rectangle of this rectangle and the given rectangle .

This function was introduced in Qt 4.2.

另请参阅 intersected ().

int QRect:: width () const

Returns the width of the rectangle.

另请参阅 setWidth (), height ()，和 size ().

int QRect:: x () const

Returns the x-coordinate of the rectangle's left edge. Equivalent to left ().

另请参阅 setX (), y ()，和 topLeft ().

int QRect:: y () const

Returns the y-coordinate of the rectangle's top edge. Equivalent to top ().

另请参阅 setY (), x ()，和 topLeft ().

QRect QRect:: operator& (const QRect & rectangle ) const

Returns the intersection of this rectangle and the given rectangle . Returns an empty rectangle if there is no intersection.

另请参阅 operator&= () 和 intersected ().

QRect &QRect:: operator&= (const QRect & rectangle )

Intersects this rectangle with the given rectangle .

另请参阅 intersected () 和 operator& ().

QRect &QRect:: operator+= (const QMargins & margins )

添加 margins to the rectangle, growing it.

This function was introduced in Qt 5.1.

另请参阅 marginsAdded (), marginsRemoved ()，和 operator-= ().

QRect &QRect:: operator-= (const QMargins & margins )

Returns a rectangle shrunk by the margins .

This function was introduced in Qt 5.1.

另请参阅 marginsRemoved (), operator+= ()，和 marginsAdded ().

QRect QRect:: operator| (const QRect & rectangle ) const

Returns the bounding rectangle of this rectangle and the given rectangle .

另请参阅 operator|= () 和 united ().

QRect &QRect:: operator|= (const QRect & rectangle )

Unites this rectangle with the given rectangle .

另请参阅 united () 和 operator| ().