QwtPicker(3)

📦
version 6.3.0 · 6 versions
, in alpine 3.24

💅 QwtPicker(3) — Library Functions Manual 💅

okay bestie, welcome to the QwtPicker(3) page from the Library Functions Manual — this is the one about selections on a widget, and it's honestly main-character energy fr fr.

🌸 NAME 🌸

QwtPicker — QwtPicker provides selections on a widget.

✨ SYNOPSIS ✨

#include <qwt_picker.h>

Inherits QObject, and QwtEventPattern.

Inherited by QwtPlotPicker, and QwtPolarPicker.

🎀 Public Types 🎀

enum RubberBand { NoRubberBand = 0, HLineRubberBand, VLineRubberBand,
    CrossRubberBand, RectRubberBand, EllipseRubberBand,
    PolygonRubberBand, UserRubberBand = 100 }
enum DisplayMode { AlwaysOff, AlwaysOn, ActiveOnly }
    Display mode.
enum ResizeMode { Stretch, KeepSize }

🧬 Public Types inherited from QwtEventPattern 🧬

enum MousePatternCode { MouseSelect1, MouseSelect2, MouseSelect3,
    MouseSelect4, MouseSelect5, MouseSelect6, MousePatternCount }
    Symbolic mouse input codes.
enum KeyPatternCode { KeySelect1, KeySelect2, KeyAbort, KeyLeft,
    KeyRight, KeyUp, KeyDown, KeyRedo, KeyUndo, KeyHome, KeyPatternCount
    }
    Symbolic keyboard input codes.

💖 Public Slots 💖

  • void setEnabled (bool) — En/disable the picker.

🦋 Signals 🦋

  • void activated (bool on)
  • void selected (const QPolygon &polygon)
  • void appended (const QPoint &pos)
  • void moved (const QPoint &pos)
  • void removed (const QPoint &pos)
  • void changed (const QPolygon &selection)

🌈 Public Member Functions 🌈

  • QwtPicker (QWidget *parent)
  • QwtPicker (RubberBand rubberBand, DisplayMode trackerMode, QWidget *)
  • virtual ~QwtPicker () — Destructor.
  • void setStateMachine (QwtPickerMachine *)
  • const QwtPickerMachine * stateMachine () const
  • QwtPickerMachine * stateMachine ()
  • void setRubberBand (RubberBand)
  • RubberBand rubberBand () const
  • void setTrackerMode (DisplayMode) — Set the display mode of the tracker.
  • DisplayMode trackerMode () const
  • void setResizeMode (ResizeMode) — Set the resize mode.
  • ResizeMode resizeMode () const
  • void setRubberBandPen (const QPen &)
  • QPen rubberBandPen () const
  • void setTrackerPen (const QPen &)
  • QPen trackerPen () const
  • void setTrackerFont (const QFont &)
  • QFont trackerFont () const
  • bool isEnabled () const
  • bool isActive () const
  • virtual bool eventFilter (QObject *, QEvent *) override — Event filter.
  • QWidget * parentWidget () — Return the parent widget, where the selection happens.
  • const QWidget * parentWidget () const — Return the parent widget, where the selection happens.
  • virtual QPainterPath pickArea () const
  • virtual void drawRubberBand (QPainter *) const
  • virtual void drawTracker (QPainter *) const
  • virtual QRegion trackerMask () const
  • virtual QRegion rubberBandMask () const
  • virtual QwtText trackerText (const QPoint &pos) const — Return the label for a position.
  • QPoint trackerPosition () const
  • virtual QRect trackerRect (const QFont &) const
  • QPolygon selection () const

🫶 Public Member Functions inherited from QwtEventPattern 🫶

  • QwtEventPattern ()
  • virtual ~QwtEventPattern () — Destructor.
  • void initMousePattern (int numButtons)
  • void initKeyPattern ()
  • void setMousePattern (MousePatternCode, Qt::MouseButton button, Qt::KeyboardModifiers=Qt::NoModifier)
  • void setKeyPattern (KeyPatternCode, int key, Qt::KeyboardModifiers modifiers=Qt::NoModifier)
  • void setMousePattern (const QVector< MousePattern > &) — Change the mouse event patterns.
  • void setKeyPattern (const QVector< KeyPattern > &) — Change the key event patterns.
  • const QVector< MousePattern > & mousePattern () const
  • const QVector< KeyPattern > & keyPattern () const
  • QVector< MousePattern > & mousePattern ()
  • QVector< KeyPattern > & keyPattern ()
  • bool mouseMatch (MousePatternCode, const QMouseEvent *) const — Compare a mouse event with an event pattern.
  • bool keyMatch (KeyPatternCode, const QKeyEvent *) const — Compare a key event with an event pattern.

👑 Protected Member Functions 👑

  • virtual QPolygon adjustedPoints (const QPolygon &) const — Map the pickedPoints() into a selection().
  • virtual void transition (const QEvent *)
  • virtual void begin ()
  • virtual void append (const QPoint &)
  • virtual void move (const QPoint &)
  • virtual void remove ()
  • virtual bool end (bool ok=true) — Close a selection setting the state to inactive.
  • virtual bool accept (QPolygon &) const — Validate and fix up the selection.
  • virtual void reset ()
  • virtual void widgetMousePressEvent (QMouseEvent *)
  • virtual void widgetMouseReleaseEvent (QMouseEvent *)
  • virtual void widgetMouseDoubleClickEvent (QMouseEvent *)
  • virtual void widgetMouseMoveEvent (QMouseEvent *)
  • virtual void widgetWheelEvent (QWheelEvent *)
  • virtual void widgetKeyPressEvent (QKeyEvent *)
  • virtual void widgetKeyReleaseEvent (QKeyEvent *)
  • virtual void widgetEnterEvent (QEvent *)
  • virtual void widgetLeaveEvent (QEvent *)
  • virtual void stretchSelection (const QSize &oldSize, const QSize &newSize)
  • virtual void updateDisplay () — Update the state of rubber band and tracker label.
  • const QwtWidgetOverlay * rubberBandOverlay () const
  • const QwtWidgetOverlay * trackerOverlay () const
  • const QPolygon & pickedPoints () const
  • QRect trackerRect (const QSize &) const

🧚 Protected Member Functions inherited from QwtEventPattern 🧚

  • virtual bool mouseMatch (const MousePattern &, const QMouseEvent *) const — Compare a mouse event with an event pattern.
  • virtual bool keyMatch (const KeyPattern &, const QKeyEvent *) const — Compare a key event with an event pattern.

💜 Detailed Description 💜

QwtPicker provides selections on a widget.

QwtPicker filters all enter, leave, mouse and keyboard events of a widget and translates them into an array of selected points.

The way how the points are collected depends on type of state machine that is connected to the picker. Qwt offers a couple of predefined state machines for selecting:

  • Nothing — QwtPickerTrackerMachine
  • Single points — QwtPickerClickPointMachine, QwtPickerDragPointMachine
  • Rectangles — QwtPickerClickRectMachine, QwtPickerDragRectMachine
  • Polygons — QwtPickerPolygonMachine

While these state machines cover the most common ways to collect points it is also possible to implement individual machines as well.

QwtPicker translates the picked points into a selection using the adjustedPoints() method. adjustedPoints() is intended to be reimplemented to fix up the selection according to application specific requirements. (F.e. when an application accepts rectangles of a fixed aspect ratio only.)

Optionally QwtPicker support the process of collecting points by a rubber band and tracker displaying a text for the current mouse position.

Example

#include <qwt_picker.h>
#include <qwt_picker_machine.h>

   QwtPicker *picker = new QwtPicker(widget);
   picker->setStateMachine(new QwtPickerDragRectMachine);
   picker->setTrackerMode(QwtPicker::ActiveOnly);
   picker->setRubberBand(QwtPicker::RectRubberBand);

The state machine triggers the following commands:

  • begin() — Activate/Initialize the selection.
  • append() — Add a new point
  • move() — Change the position of the last point.
  • remove() — Remove the last point.
  • end() — Terminate the selection and call accept to validate the picked points.

The picker is active (isActive()), between begin() and end(). In active state the rubber band is displayed, and the tracker is visible in case of trackerMode is ActiveOnly or AlwaysOn.

The cursor can be moved using the arrow keys. All selections can be aborted using the abort key. (QwtEventPattern::KeyPatternCode)

Warning: In case of QWidget::NoFocus the focus policy of the observed widget is set to QWidget::WheelFocus and mouse tracking will be manipulated while the picker is active, or if trackerMode() is AlwayOn.

Definition at line 103 of file qwt_picker.h.

🔥 Member Enumeration Documentation 🔥

enum QwtPicker::DisplayMode

Display mode.

See also setTrackerMode(), trackerMode(), isActive()

Enumerator

  • AlwaysOff — Display never.
  • AlwaysOn — Display always.
  • ActiveOnly — Display only when the selection is active.

Definition at line 161 of file qwt_picker.h.

enum QwtPicker::ResizeMode

Controls what to do with the selected points of an active selection when the observed widget is resized.

The default value is QwtPicker::Stretch.

See also setResizeMode()

Enumerator

  • Stretch — All points are scaled according to the new size,.
  • KeepSize — All points remain unchanged.

Definition at line 181 of file qwt_picker.h.

enum QwtPicker::RubberBand

Rubber band style

The default value is QwtPicker::NoRubberBand.

See also setRubberBand(), rubberBand()

Enumerator

  • NoRubberBand — No rubberband.
  • HLineRubberBand — A horizontal line ( only for QwtPickerMachine::PointSelection ).
  • VLineRubberBand — A vertical line ( only for QwtPickerMachine::PointSelection ).
  • CrossRubberBand — A crosshair ( only for QwtPickerMachine::PointSelection ).
  • RectRubberBand — A rectangle ( only for QwtPickerMachine::RectSelection ).
  • EllipseRubberBand — An ellipse ( only for QwtPickerMachine::RectSelection ).
  • PolygonRubberBand — A polygon ( only for QwtPickerMachine::PolygonSelection ).
  • UserRubberBand — Values >= UserRubberBand can be used to define additional rubber bands.

Definition at line 127 of file qwt_picker.h.

🎀 Constructor & Destructor Documentation 🎀

QwtPicker::QwtPicker (QWidget * parent) [explicit]

Constructor

Creates an picker that is enabled, but without a state machine. rubber band and tracker are disabled.

Parameters

  • parent — Parent widget, that will be observed

Definition at line 169 of file qwt_picker.cpp.

QwtPicker::QwtPicker (RubberBand rubberBand, DisplayMode trackerMode, QWidget * parent) [explicit]

Constructor

Parameters

  • rubberBand — Rubber band style
  • trackerMode — Tracker mode
  • parent — Parent widget, that will be observed

Definition at line 182 of file qwt_picker.cpp.

QwtPicker::~QwtPicker () [virtual]

Destructor.

Definition at line 190 of file qwt_picker.cpp.

💫 Member Function Documentation 💫

bool QwtPicker::accept (QPolygon & selection) const [protected], [virtual]

Validate and fix up the selection. Accepts all selections unmodified

Parameters

  • selection — Selection to validate and fix up

Returns

true, when accepted, false otherwise

Reimplemented in QwtPlotZoomer.

Definition at line 1402 of file qwt_picker.cpp.

void QwtPicker::activated (bool on) — [signal] 🔔

okay so this is the signal that goes off when the picker has been activated. bestie, the cute part: paired up with setEnabled() it's literally how you build selections with more than one picker. team work makes the dream work 💅

  • Parameters
    • on — True, when the picker has been activated

QPolygon QwtPicker::adjustedPoints (const QPolygon & points) const — [protected], [virtual] 🧚

This one maps the pickedPoints() into a selection(). Like, adjustedPoints() takes the points that got collected on the parentWidget() and turns them into a selection. The default implementation is super chill and just returns the points unmodified.

The reason a selection() can differ from the picked points? Depends on what your app needs. F.e.:

  • A rectangular selection might need to have a specific aspect ratio only.
  • A selection could accept non intersecting polygons only.
  • ...

The example below is for a rectangular selection, where the first point is the center of the selected rectangle.

Example

QPolygon MyPicker::adjustedPoints( const QPolygon &points ) const
{
    QPolygon adjusted;
    if ( points.size() == 2 )
    {
        const int width = qAbs( points[1].x() - points[0].x() );
        const int height = qAbs( points[1].y() - points[0].y() );

        QRect rect( 0, 0, 2 * width, 2 * height );
        rect.moveCenter( points[0] );

        adjusted += rect.topLeft();
        adjusted += rect.bottomRight();
    }
    return adjusted;
}
  • Parameters
    • points — Selected points
  • Returns
    • Selected points unmodified

Definition at line 783 of file qwt_picker.cpp.

void QwtPicker::append (const QPoint & pos) — [protected], [virtual] ➕

Append a point to the selection and update rubber band and tracker. The appended() signal is emitted. slay, that's the whole vibe 🌸

  • Parameters
    • pos — Additional point
  • See also
    • isActive(), begin(), end(), move(), appended()

Reimplemented in QwtPlotPicker, and QwtPolarPicker.

Definition at line 1339 of file qwt_picker.cpp.

void QwtPicker::appended (const QPoint & pos) — [signal] 📍

A signal emitted when a point has been appended to the selection.

  • Parameters
    • pos — Position of the appended point.
  • See also
    • append(). moved()

void QwtPicker::begin () — [protected], [virtual] 🎬

Open a selection setting the state to active. it's giving opening night energy ✨

  • See also
    • isActive(), end(), append(), move()

Reimplemented in QwtPlotZoomer.

Definition at line 1258 of file qwt_picker.cpp.

void QwtPicker::changed (const QPolygon & selection) — [signal] 🦋

A signal emitted when the active selection has been changed. This might happen when the observed widget is resized. (like when your fave resizes their whole personality, honestly)

  • Parameters
    • selection — Changed selection
  • See also
    • stretchSelection()

void QwtPicker::drawRubberBand (QPainter * painter) const — [virtual] 🎀

Draw a rubber band, depending on rubberBand().

  • Parameters
    • painter — Painter, initialized with a clip region
  • See also
    • rubberBand(), RubberBand

Definition at line 637 of file qwt_picker.cpp.

void QwtPicker::drawTracker (QPainter * painter) const — [virtual] 🖊️

Draw the tracker. no cap, that's it.

  • Parameters
    • painter — Painter
  • See also
    • trackerRect(), trackerText()

Definition at line 732 of file qwt_picker.cpp.

bool QwtPicker::end (bool ok = true) — [protected], [virtual] 🏁

Close a selection setting the state to inactive. The selection is validated and maybe fixed by accept().

  • Parameters
    • ok — If true, complete the selection and emit a selected signal otherwise discard the selection.
  • Returns
    • true if the selection is accepted, false otherwise
  • See also
    • isActive(), begin(), append(), move(), selected(), accept()

Reimplemented in QwtPlotPicker, QwtPlotZoomer, and QwtPolarPicker.

Definition at line 1291 of file qwt_picker.cpp.

bool QwtPicker::eventFilter (QObject * object, QEvent * event) — [override], [virtual] 🕵️‍♀️

Event filter. When isEnabled() is true all events of the observed widget are filtered. Mouse and keyboard events are translated into widgetMouse- and widgetKey- and widgetWheel-events. Paint and Resize events are handled to keep rubber band and tracker up to date.

  • Parameters
    • object — Object to be filtered
    • event — Event
  • Returns
    • Always false.
  • See also
    • widgetEnterEvent(), widgetLeaveEvent(), widgetMousePressEvent(), widgetMouseReleaseEvent(), widgetMouseDoubleClickEvent(), widgetMouseMoveEvent(), widgetWheelEvent(), widgetKeyPressEvent(), widgetKeyReleaseEvent(), QObject::installEventFilter(), QObject::event()

Definition at line 912 of file qwt_picker.cpp.

bool QwtPicker::isActive () const — 💫

A picker is active between begin() and end().

  • Returns
    • true if the selection is active.

Definition at line 1412 of file qwt_picker.cpp.

bool QwtPicker::isEnabled () const — 🔘

  • Returns
    • true when enabled, false otherwise
  • See also
    • setEnabled(), eventFilter()

Definition at line 400 of file qwt_picker.cpp.

void QwtPicker::move (const QPoint & pos) — [protected], [virtual] 🕹️

Move the last point of the selection. The moved() signal is emitted.

  • Parameters
    • pos — New position
  • See also
    • isActive(), begin(), end(), append()

Reimplemented in QwtPlotPicker, and QwtPolarPicker.

Definition at line 1357 of file qwt_picker.cpp.

void QwtPicker::moved (const QPoint & pos) — [signal] 🌈

A signal emitted whenever the last appended point of the selection has been moved.

  • Parameters
    • pos — Position of the moved last point of the selection.
  • See also
    • move(), appended()

QWidget * QwtPicker::parentWidget () — 🏠

Return the parent widget, where the selection happens.

Definition at line 263 of file qwt_picker.cpp.

const QWidget * QwtPicker::parentWidget () const — 🏠

Return the parent widget, where the selection happens. (yes bestie, the const version also exists, they're twins 💜)

Definition at line 273 of file qwt_picker.cpp.

QPainterPath QwtPicker::pickArea () const — [virtual] 🗺️

Find the area of the observed widget, where selection might happen.

  • Returns
    • parentWidget()->contentsRect()

Reimplemented in QwtPolarPicker.

Definition at line 1493 of file qwt_picker.cpp.

const QPolygon & QwtPicker::pickedPoints () const — [protected] 📌

Return the points, that have been collected so far. The selection() is calculated from the pickedPoints() in adjustedPoints().

  • Returns
    • Picked points

Definition at line 1422 of file qwt_picker.cpp.

void QwtPicker::remove () — [protected], [virtual] 🗑️

Remove the last point of the selection. The removed() signal is emitted. not me deleting the last point like it's an old draft 😭

  • See also
    • isActive(), begin(), end(), append(), move()

Definition at line 1378 of file qwt_picker.cpp.

void QwtPicker::removed (const QPoint & pos) — [signal] 💀

A signal emitted whenever the last appended point of the selection has been removed.

  • Parameters
    • pos — Position of the point, that has been removed
  • See also
    • remove(), appended()

void QwtPicker::reset () — [protected], [virtual] 🔄

Reset the state machine and terminate (end(false)) the selection. full factory reset vibes, we're starting fresh 🫶

Definition at line 1322 of file qwt_picker.cpp.

QwtPicker::ResizeMode QwtPicker::resizeMode () const — 📐

  • Returns
    • Resize mode
  • See also
    • setResizeMode(), ResizeMode

Definition at line 362 of file qwt_picker.cpp.

QwtPicker::RubberBand QwtPicker::rubberBand () const — 🎗️

  • Returns
    • Rubber band style
  • See also
    • setRubberBand(), RubberBand, rubberBandPen()

Definition at line 299 of file qwt_picker.cpp.

QRegion QwtPicker::rubberBandMask () const — [virtual] 🎭

Calculate the mask for the rubber band overlay.

  • Returns
    • Region for the mask
  • See also
    • QWidget::setMask()

Definition at line 526 of file qwt_picker.cpp.

const QwtWidgetOverlay * QwtPicker::rubberBandOverlay () const — [protected] 🪞

  • Returns
    • Overlay displaying the rubber band

Definition at line 1600 of file qwt_picker.cpp.

QPen QwtPicker::rubberBandPen () const — ✒️

  • Returns
    • Rubber band pen
  • See also
    • setRubberBandPen(), rubberBand()

Definition at line 473 of file qwt_picker.cpp.

void QwtPicker::selected (const QPolygon & polygon) — [signal] 🎉

A signal emitting the selected points, at the end of a selection. the finale, the grand reveal, the main character moment 👑

  • Parameters
    • polygon — Selected points

QPolygon QwtPicker::selection () const — 🧺

  • Returns
    • Selected points
  • See also
    • pickedPoints(), adjustedPoints()

Definition at line 792 of file qwt_picker.cpp.

void QwtPicker::setEnabled (bool enabled) — [slot] 🔌

En/disable the picker. When enabled is true an event filter is installed for the observed widget, otherwise the event filter is removed.

  • Parameters
    • enabled — true or false
  • See also
    • isEnabled(), eventFilter()

Definition at line 376 of file qwt_picker.cpp.

void QwtPicker::setResizeMode (ResizeMode mode) — 📏

Set the resize mode. The resize mode controls what to do with the selected points of an active selection when the observed widget is resized.

Stretch means the points are scaled according to the new size, KeepSize means the points remain unchanged.

The default mode is Stretch.

  • Parameters
    • mode — Resize mode
  • See also
    • resizeMode(), ResizeMode

Definition at line 352 of file qwt_picker.cpp.

void QwtPicker::setRubberBand (RubberBand rubberBand) — 🎨

Set the rubber band style.

  • Parameters
    • rubberBand — Rubber band style The default value is NoRubberBand.
  • See also
    • rubberBand(), RubberBand, setRubberBandPen()

Definition at line 290 of file qwt_picker.cpp.

void QwtPicker::setRubberBandPen (const QPen & pen) — 🖌️

Set the pen for the rubberband.

  • Parameters
    • pen — Rubber band pen
  • See also
    • rubberBandPen(), setRubberBand()

Definition at line 460 of file qwt_picker.cpp.

void QwtPicker::setStateMachine (QwtPickerMachine * stateMachine) — ⚙️

Set a state machine and delete the previous one. lowkey savage, the old one gets yeeted immediately 💀

  • Parameters
    • stateMachine — State machine
  • See also
    • stateMachine()

Definition at line 230 of file qwt_picker.cpp.

void QwtPicker::setTrackerFont (const QFont & font) — 🔤

Set the font for the tracker.

  • Parameters
    • font — Tracker font
  • See also
    • trackerFont(), setTrackerMode(), setTrackerPen()

Definition at line 411 of file qwt_picker.cpp.

void QwtPicker::setTrackerMode (DisplayMode mode) — 👀

Set the display mode of the tracker. A tracker displays information about current position of the cursor as a string. The display mode controls if the tracker has to be displayed whenever the observed widget has focus and cursor (AlwaysOn), never (AlwaysOff), or only when the selection is active (ActiveOnly).

  • Parameters
    • mode — Tracker display mode
Warning ⚠️ In case of AlwaysOn, mouseTracking will be enabled for the observed widget.

See also trackerMode(), DisplayMode — bestie, go read those too, they're right there 👀

Definition at line 320 of file qwt_picker.cpp.

void QwtPicker::setTrackerPen(const QPen &pen)

Sets the pen for the tracker ✨ like, the actual ink of the little text box that follows your cursor around.

Parameters

  • pen — Tracker pen

See also: trackerPen(), setTrackerMode(), setTrackerFont()

Definition at line 436 of file qwt_picker.cpp.

QwtPickerMachine *QwtPicker::stateMachine()

Returns

  • Assigned state machine

See also: setStateMachine()

Definition at line 248 of file qwt_picker.cpp.

const QwtPickerMachine *QwtPicker::stateMachine() const

Same icon, but the const version 💅

Returns

  • Assigned state machine

See also: setStateMachine()

Definition at line 257 of file qwt_picker.cpp.

void QwtPicker::stretchSelection(const QSize &oldSize, const QSize &newSize) [protected], [virtual]

Scales the selection by the ratios of oldSize and newSize, and bestie, the changed() signal is emitted. No cap.

Parameters

  • oldSize — Previous size
  • newSize — Current size

See also: ResizeMode, setResizeMode(), resizeMode()

Definition at line 1436 of file qwt_picker.cpp.

QFont QwtPicker::trackerFont() const

Returns

  • Tracker font

See also: setTrackerFont(), trackerMode(), trackerPen()

Definition at line 425 of file qwt_picker.cpp.

QRegion QwtPicker::trackerMask() const [virtual]

Calculates the mask for the tracker overlay. It's giving "one rectangle, that's it, that's the whole vibe."

Returns

  • Region with one rectangle: trackerRect( trackerFont() );

See also: QWidget::setMask(), trackerRect()

Definition at line 515 of file qwt_picker.cpp.

QwtPicker::DisplayMode QwtPicker::trackerMode() const

Returns

  • Tracker display mode

See also: setTrackerMode(), DisplayMode

Definition at line 333 of file qwt_picker.cpp.

const QwtWidgetOverlay *QwtPicker::trackerOverlay() const [protected]

Returns

  • Overlay displaying the tracker text

Definition at line 1606 of file qwt_picker.cpp.

QPen QwtPicker::trackerPen() const

Returns

  • Tracker pen

See also: setTrackerPen(), trackerMode(), trackerFont()

Definition at line 449 of file qwt_picker.cpp.

QPoint QwtPicker::trackerPosition() const

Returns

  • Current position of the tracker

Definition at line 798 of file qwt_picker.cpp.

QRect QwtPicker::trackerRect(const QFont &font) const [virtual]

Calculates the bounding rectangle for the tracker text from the current position of the tracker. Math but make it cute 🎀

Parameters

  • font — Font of the tracker text

Returns

  • Bounding rectangle of the tracker text

See also: trackerPosition()

Definition at line 812 of file qwt_picker.cpp.

QRect QwtPicker::trackerRect(const QSize &size) const [protected]

Calculates the geometry of the tracker that's needed to display information of a specific size at the tracker position. Lowkey the same energy as the other one, but you're handing it a size instead of a font.

Parameters

  • size — Size

Returns

  • Bounding rectangle of the tracker

See also: trackerPosition()

Definition at line 844 of file qwt_picker.cpp.

QwtText QwtPicker::trackerText(const QPoint &pos) const [virtual]

Returns the label for a position. Okay so here's the tea ☕:

  • In case of HLineRubberBand, the label is the value of the y position.
  • In case of VLineRubberBand, the value of the x position.
  • Otherwise, the label contains x and y position separated by a ','.

The format for the string conversion is "%d".

Parameters

  • pos — Position

Returns

  • Converted position as string

Reimplemented in QwtPlotPicker, and QwtPolarPicker.

Definition at line 491 of file qwt_picker.cpp.

void QwtPicker::transition(const QEvent *event) [protected], [virtual]

Passes an event to the state machine and executes the resulting commands. Heads up bestie: Append and Move commands use the current position of the cursor (QCursor::pos()).

Parameters

  • event — Event

Definition at line 1195 of file qwt_picker.cpp.

void QwtPicker::updateDisplay() [protected], [virtual]

Updates the state of the rubber band and the tracker label. Glow-up for the display ✨

Definition at line 1505 of file qwt_picker.cpp.

void QwtPicker::widgetEnterEvent(QEvent *event) [protected], [virtual]

Handles an enter event for the observed widget. Like, cursor said hi 👋

Parameters

  • event — Qt event

See also: eventFilter(), widgetMousePressEvent(), widgetMouseReleaseEvent(), widgetMouseDoubleClickEvent(), widgetWheelEvent(), widgetKeyPressEvent(), widgetKeyReleaseEvent()

Definition at line 1037 of file qwt_picker.cpp.

void QwtPicker::widgetKeyPressEvent(QKeyEvent *keyEvent) [protected], [virtual]

Handles a key press event for the observed widget. And no cap, you can do the entire selection with the keyboard:

  • The arrow keys move the cursor.
  • The abort key aborts a selection.
  • All other keys are handled by the current state machine.

Parameters

  • keyEvent — Key event

See also: eventFilter(), widgetMousePressEvent(), widgetMouseReleaseEvent(), widgetMouseDoubleClickEvent(), widgetMouseMoveEvent(), widgetWheelEvent(), widgetKeyReleaseEvent(), stateMachine(), QwtEventPattern::KeyPatternCode

Reimplemented in QwtPlotZoomer.

Definition at line 1131 of file qwt_picker.cpp.

void QwtPicker::widgetKeyReleaseEvent(QKeyEvent *keyEvent) [protected], [virtual]

Handles a key release event for the observed widget. Passes the event to the state machine. That's it, that's the whole job 🫶

Parameters

  • keyEvent — Key event

See also: eventFilter(), widgetMousePressEvent(), widgetMouseReleaseEvent(), widgetMouseDoubleClickEvent(), widgetMouseMoveEvent(), widgetWheelEvent(), widgetKeyPressEvent(), stateMachine()

Definition at line 1183 of file qwt_picker.cpp.

void QwtPicker::widgetLeaveEvent(QEvent *event) [protected], [virtual]

Handles a leave event for the observed widget. Cursor said bye 😭

Parameters

  • event — Qt event

See also: eventFilter(), widgetMousePressEvent(), widgetMouseReleaseEvent(), widgetMouseDoubleClickEvent(), widgetWheelEvent(), widgetKeyPressEvent(), widgetKeyReleaseEvent()

Definition at line 1051 of file qwt_picker.cpp.

void QwtPicker::widgetMouseDoubleClickEvent(QMouseEvent *mouseEvent) [protected], [virtual]

Handles a mouse double click event for the observed widget. Double tap energy ✌️✌️

Parameters

  • mouseEvent — Mouse event

See also: eventFilter(), widgetMousePressEvent(), widgetMouseReleaseEvent(), widgetMouseMoveEvent(), widgetWheelEvent(), widgetKeyPressEvent(), widgetKeyReleaseEvent()

Definition at line 1083 of file qwt_picker.cpp.

void QwtPicker::widgetMouseMoveEvent(QMouseEvent *mouseEvent) [protected], [virtual]

Handles a mouse move event for the observed widget. The cursor is literally moving, we love a main character in motion 🦋

Parameters

  • mouseEvent — Mouse event

See also: eventFilter(), widgetMousePressEvent(), widgetMouseReleaseEvent(), widgetMouseDoubleClickEvent(), widgetWheelEvent(), widgetKeyPressEvent(), widgetKeyReleaseEvent()

Definition at line 1015 of file qwt_picker.cpp.

void QwtPicker::widgetMousePressEvent(QMouseEvent *mouseEvent) [protected], [virtual]

Handles a mouse press event for the observed widget. Click clack, here we go 💅

Parameters

  • mouseEvent — Mouse event

See also: eventFilter(), widgetMouseReleaseEvent(), widgetMouseDoubleClickEvent(), widgetMouseMoveEvent(), widgetWheelEvent(), widgetKeyPressEvent(), widgetKeyReleaseEvent()

Definition at line 1001 of file qwt_picker.cpp.

void QwtPicker::widgetMouseReleaseEvent(QMouseEvent *mouseEvent) [protected], [virtual]

Handles a mouse release event for the observed widget. And that's a wrap on the click 🎬

Parameters

  • mouseEvent — Mouse event

See also: eventFilter(), widgetMousePressEvent(), widgetMouseDoubleClickEvent(), widgetMouseMoveEvent(), widgetWheelEvent(), widgetKeyPressEvent(), widgetKeyReleaseEvent()

Reimplemented in QwtPlotZoomer.

Definition at line 1069 of file qwt_picker.cpp.

void QwtPicker::widgetWheelEvent(QWheelEvent *wheelEvent) [protected], [virtual]

Handles a wheel event for the observed widget. Specifically: it moves the last point of the selection in case of isActive() == true. Scrolling with purpose 🌈

Parameters

  • wheelEvent — Wheel event

See also: eventFilter(), widgetMousePressEvent(), widgetMouseReleaseEvent(), widgetMouseDoubleClickEvent(), widgetMouseMoveEvent(), widgetKeyPressEvent(), widgetKeyReleaseEvent()

Definition at line 1100 of file qwt_picker.cpp.

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