QColorLuminancePicker Class Reference

Inheritance diagram for QColorLuminancePicker:

[legend]Collaboration diagram for QColorLuminancePicker:

[legend]List of all members.

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Detailed Description

Definition at line 650 of file qcolordialog.cpp.

Public Slots
void	setCol (int h, int s, int v)
void	setCol (int h, int s)
Signals
void	newHsv (int h, int s, int v)
Public Member Functions
	QColorLuminancePicker (QWidget *parent=0)
	~QColorLuminancePicker ()
Protected Member Functions
void	paintEvent (QPaintEvent *)
void	mouseMoveEvent (QMouseEvent *)
void	mousePressEvent (QMouseEvent *)
Private Types
enum
Private Member Functions
int	y2val (int y)
int	val2y (int val)
void	setVal (int v)
Private Attributes
int	val
int	hue
int	sat
QPixmap *	pix

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Member Enumeration Documentation

anonymous enum [private]

Definition at line 670 of file qcolordialog.cpp.

{ foff = 3, coff = 4 }; //frame and contents offset

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Constructor & Destructor Documentation

QColorLuminancePicker::QColorLuminancePicker

(

QWidget *

parent = 0

)

Definition at line 695 of file qcolordialog.cpp.

References hue, pix, sat, and val.

    :QWidget(parent)
{
    hue = 100; val = 100; sat = 100;
    pix = 0;
    //    setAttribute(WA_NoErase, true);
}

QColorLuminancePicker::~QColorLuminancePicker

(

)

Definition at line 703 of file qcolordialog.cpp.

References pix.

{
    delete pix;
}

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Member Function Documentation

void QColorLuminancePicker::setCol	(	int	h,
		int	s,
		int	v
	)			[slot]

Definition at line 768 of file qcolordialog.cpp.

References hue, pix, QWidget::repaint(), sat, and val.

Referenced by QColorDialogPrivate::_q_newColorTypedIn(), QColorDialogPrivate::_q_newHsv(), and setCol().

{
    val = v;
    hue = h;
    sat = s;
    delete pix; pix=0;
    repaint();
}

void QColorLuminancePicker::setCol	(	int	h,
		int	s
	)			[slot]

Definition at line 728 of file qcolordialog.cpp.

References emit, newHsv(), setCol(), and val.

{
    setCol(h, s, val);
    emit newHsv(h, s, val);
}

void QColorLuminancePicker::newHsv	(	int	h,
		int	s,
		int	v
	)			[signal]

Referenced by setCol(), and setVal().

void QColorLuminancePicker::paintEvent

(

QPaintEvent *

)

[protected, virtual]

This event handler can be reimplemented in a subclass to receive paint events which are passed in the event parameter.

A paint event is a request to repaint all or part of the widget. It can happen as a result of repaint() or update(), or because the widget was obscured and has now been uncovered, or for many other reasons.

Many widgets can simply repaint their entire surface when asked to, but some slow widgets need to optimize by painting only the requested region: QPaintEvent::region(). This speed optimization does not change the result, as painting is clipped to that region during event processing. QListView and QTableView do this, for example.

Qt also tries to speed up painting by merging multiple paint events into one. When update() is called several times or the window system sends several paint events, Qt merges these events into one event with a larger region (see QRegion::united()). repaint() does not permit this optimization, so we suggest using update() whenever possible.

When the paint event occurs, the update region has normally been erased, so that you're painting on the widget's background.

The background can be set using setBackgroundRole() and setPalette().

From Qt 4.0, QWidget automatically double-buffers its painting, so there's no need to write double-buffering code in paintEvent() to avoid flicker.

Note: Under X11 it is possible to toggle the global double buffering by calling qt_x11_set_global_double_buffer(). Example usage:

    ...
    extern void qt_x11_set_global_double_buffer(bool);
    qt_x11_set_global_double_buffer(false);
    ...

See also:

event(), repaint(), update(), QPainter, QPixmap, QPaintEvent, {Analog Clock Example}

Reimplemented from QWidget.

Definition at line 734 of file qcolordialog.cpp.

References a, c, coff, foff, QImage::Format_RGB32, QPixmap::fromImage(), g, QWidget::height(), QPixmap::height(), QRect::height(), hue, p, QWidget::palette(), pix, qDrawShadePanel(), QWidget::QPixmap, QRgb, sat, QImage::setPixel(), val, val2y(), w, QRect::width(), QPixmap::width(), QWidget::width(), QWidget::x(), QWidget::y(), and y2val().

{
    int w = width() - 5;

    QRect r(0, foff, w, height() - 2*foff);
    int wi = r.width() - 2;
    int hi = r.height() - 2;
    if (!pix || pix->height() != hi || pix->width() != wi) {
        delete pix;
        QImage img(wi, hi, QImage::Format_RGB32);
        int y;
        for (y = 0; y < hi; y++) {
            QColor c;
            c.setHsv(hue, sat, y2val(y+coff));
            QRgb r = c.rgb();
            int x;
            for (x = 0; x < wi; x++)
                img.setPixel(x, y, r);
        }
        pix = new QPixmap(QPixmap::fromImage(img));
    }
    QPainter p(this);
    p.drawPixmap(1, coff, *pix);
    const QPalette &g = palette();
    qDrawShadePanel(&p, r, g, true);
    p.setPen(g.foreground().color());
    p.setBrush(g.foreground());
    QPolygon a;
    int y = val2y(val);
    a.setPoints(3, w, y, w+5, y+5, w+5, y-5);
    p.eraseRect(w, 0, 5, height());
    p.drawPolygon(a);
}

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void QColorLuminancePicker::mouseMoveEvent

(

QMouseEvent *

m

)

[protected, virtual]

This event handler, for event event, can be reimplemented in a subclass to receive mouse move events for the widget.

If mouse tracking is switched off, mouse move events only occur if a mouse button is pressed while the mouse is being moved. If mouse tracking is switched on, mouse move events occur even if no mouse button is pressed.

QMouseEvent::pos() reports the position of the mouse cursor, relative to this widget. For press and release events, the position is usually the same as the position of the last mouse move event, but it might be different if the user's hand shakes. This is a feature of the underlying window system, not Qt.

See also:

setMouseTracking(), mousePressEvent(), mouseReleaseEvent(), mouseDoubleClickEvent(), event(), QMouseEvent, {Scribble Example}

Reimplemented from QWidget.

Definition at line 708 of file qcolordialog.cpp.

References m, setVal(), and y2val().

{
    setVal(y2val(m->y()));
}

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void QColorLuminancePicker::mousePressEvent

(

QMouseEvent *

m

)

[protected, virtual]

This event handler, for event event, can be reimplemented in a subclass to receive mouse press events for the widget.

If you create new widgets in the mousePressEvent() the mouseReleaseEvent() may not end up where you expect, depending on the underlying window system (or X11 window manager), the widgets' location and maybe more.

The default implementation implements the closing of popup widgets when you click outside the window. For other widget types it does nothing.

See also:

mouseReleaseEvent(), mouseDoubleClickEvent(), mouseMoveEvent(), event(), QMouseEvent, {Scribble Example}

Reimplemented from QWidget.

Definition at line 712 of file qcolordialog.cpp.

References m, setVal(), and y2val().

{
    setVal(y2val(m->y()));
}

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int QColorLuminancePicker::y2val

(

int

y

)

[private]

Definition at line 683 of file qcolordialog.cpp.

References coff, d, and QWidget::height().

Referenced by mouseMoveEvent(), mousePressEvent(), and paintEvent().

{
    int d = height() - 2*coff - 1;
    return 255 - (y - coff)*255/d;
}

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int QColorLuminancePicker::val2y

(

int

val

)

[private]

Definition at line 689 of file qcolordialog.cpp.

References coff, d, and QWidget::height().

Referenced by paintEvent().

{
    int d = height() - 2*coff - 1;
    return coff + (255-v)*d/255;
}

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void QColorLuminancePicker::setVal

(

int

v

)

[private]

Definition at line 717 of file qcolordialog.cpp.

References emit, hue, newHsv(), pix, qMax(), qMin(), QWidget::repaint(), sat, and val.

Referenced by mouseMoveEvent(), and mousePressEvent().

{
    if (val == v)
        return;
    val = qMax(0, qMin(v,255));
    delete pix; pix=0;
    repaint();
    emit newHsv(hue, sat, val);
}

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Member Data Documentation

int QColorLuminancePicker::val [private]

Definition at line 671 of file qcolordialog.cpp.

Referenced by paintEvent(), QColorLuminancePicker(), setCol(), and setVal().

int QColorLuminancePicker::hue [private]

Definition at line 672 of file qcolordialog.cpp.

Referenced by paintEvent(), QColorLuminancePicker(), setCol(), and setVal().

int QColorLuminancePicker::sat [private]

Definition at line 673 of file qcolordialog.cpp.

Referenced by paintEvent(), QColorLuminancePicker(), setCol(), and setVal().

QPixmap* QColorLuminancePicker::pix [private]

Definition at line 679 of file qcolordialog.cpp.

Referenced by paintEvent(), QColorLuminancePicker(), setCol(), setVal(), and ~QColorLuminancePicker().

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The documentation for this class was generated from the following file:

• src/gui/dialogs/qcolordialog.cpp

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