class TQtWidget: public QWidget
TQtWidget is a QWidget with the QPixmap double buffer
It is designed to back the ROOT TCanvasImp class interface and it can be used
as a regular Qt Widget to create Qt-based GUI with the embedded TCanvas objects
This widget can be used as a Qt "custom widget"
to build a custom GUI interfaces with Qt Designer
The class emits the Qt signals and has Qt public slots
Public slots: (Qt)
virtual void cd(); // make the associated TCanvas the current one (shortcut to TCanvas::cd())
virtual void cd(int subpadnumber); // as above - shortcut to Canvas::cd(int subpadnumber)
void Disconnect(); // disconnect the QWidget from the ROOT TCanvas (used in the class dtor)
void Refresh(); // force the associated TCanvas::Update to be called
virtual bool Save(const QString &fileName) const; // Save the widget image with some ppixmap file
virtual bool Save(const char *fileName) const;
virtual bool Save(const QString &fileName,const char *format,int quality=60) const;
virtual bool Save(const char *fileName,const char *format,int quality=60) const;
signals (Qt)
CanvasPainted(); // Signal the TCanvas has been painted onto the screen
Saved(bool ok); // Signal the TCanvas has been saved into the file
RootEventProcessed(TObject *selected, unsigned int event, TCanvas *c);
// Signal the Qt mouse/keyboard event has been process by ROOT
// This "signal" is emitted by the enabled mouse events only.
// See: EnableSignalEvents
// --- DisableSignalEvents
public methods:
The methods below define whether the TQtWidget object emits "RootEventProcessed" Qt signals
(By default no RootEventProcessed Qt signal is emitted )
void EnableSignalEvents (UInt_t f)
void DisableSignalEvents(UInt_t f),
where f is a bitwise OR of the mouse event flags:
kMousePressEvent // TCanvas processed QEvent mousePressEvent
kMouseMoveEvent // TCanvas processed QEvent mouseMoveEvent
kMouseReleaseEvent // TCanvas processed QEvent mouseReleaseEvent
kMouseDoubleClickEvent // TCanvas processed QEvent mouseDoubleClickEvent
kKeyPressEvent // TCanvas processed QEvent keyPressEvent
kEnterEvent // TCanvas processed QEvent enterEvent
kLeaveEvent // TCanvas processed QEvent leaveEvent
For example to create the custom responce to the mouse crossing TCanvas
connect the RootEventProsecced signal with your qt slot:
connect(tQtWidget,SIGNAL(RootEventProcessed(TObject *, unsigned int, TCanvas *))
,this,SLOT(CanvasEvent(TObject *, unsigned int, TCanvas *)));
. . .
void qtrootexample1::CanvasEvent(TObject *obj, unsigned int event, TCanvas *)
{
TQtWidget *tipped = (TQtWidget *)sender();
const char *objectInfo =
obj->GetObjectInfo(tipped->GetEventX(),tipped->GetEventY());
QString tipText ="You have ";
if (tipped == tQtWidget1)
tipText +="clicked";
else
tipText +="passed";
tipText += " the object <";
tipText += obj->GetName();
tipText += "> of class ";
tipText += obj->ClassName();
tipText += " : ";
tipText += objectInfo;
QWhatsThis::display(tipText)
}
Function Members (Methods)
public:
| TQtWidget(QWidget* parent = 0) |
virtual | ~TQtWidget() |
static TCanvas* | Canvas(TQtWidget* widget) |
static TQtWidget* | Canvas(const TCanvas* canvas) |
static TQtWidget* | Canvas(Int_t id) |
virtual void | cd() |
virtual void | cd(int subpadnumber) |
static TClass* | Class() |
void | DisableSignalEvents(UInt_t f) |
void | Disconnect() |
void | EmitSignal(UInt_t f) |
void | EmitTestedSignal() |
void | EnableSignalEvents(UInt_t f) |
virtual void | Erase() |
UInt_t | GetAllBits() const |
const TQtWidgetBuffer* | GetBuffer() const |
TCanvas* | GetCanvas() const |
Int_t | GetEvent() const |
Int_t | GetEventX() const |
Int_t | GetEventY() const |
QPixmap* | GetOffScreenBuffer() const |
TObject* | GetSelected() const |
TVirtualPad* | GetSelectedPad() const |
Int_t | GetSelectedX() const |
Int_t | GetSelectedY() const |
static TApplication* | InitRint(Bool_t prompt = kFALSE, const char* appClassName = "QtRint", int* argc = 0, char** argv = 0, void* options = 0, int numOptions = 0, Bool_t noLogo = kTRUE) |
void | InvertBit(UInt_t f) |
virtual TClass* | IsA() const |
bool | IsDoubleBuffered() const |
Bool_t | IsSignalEventEnabled(UInt_t f) const |
virtual QSize | minimumSizeHint() const |
void | Refresh() |
void | ResetBit(UInt_t f) |
virtual bool | Save(const QString& fileName) const |
virtual bool | Save(const char* fileName) const |
virtual bool | Save(const QString& fileName, const char* format, int quality = 60) const |
virtual bool | Save(const char* fileName, const char* format, int quality = 60) const |
void | SetAllBits(UInt_t f) |
void | SetBit(UInt_t f) |
void | SetBit(UInt_t f, Bool_t set) |
TQtWidgetBuffer& | SetBuffer() |
void | SetCanvas(TCanvas* c) |
void | SetDoubleBuffer(bool on = TRUE) |
virtual void | SetSaveFormat(const char* format) |
virtual void | ShowMembers(TMemberInspector& insp, char* parent) |
virtual QSize | sizeHint() const |
virtual QSizePolicy | sizePolicy() const |
virtual void | Streamer(TBuffer& b) |
void | StreamerNVirtual(TBuffer& b) |
Bool_t | TestBit(UInt_t f) const |
Int_t | TestBits(UInt_t f) const |
Data Members
private:
enum { | kBitMask | |
| kEXITSIZEMOVE | |
| kENTERSIZEMOVE | |
| kFORCESIZE | |
}; | | |
protected:
TCanvas* | fCanvas | |
bool | fDoubleBufferOn | |
bool | fEmbedded | |
int | fIgnoreLeaveEnter | |
bool | fInsidePaintEvent | |
QPoint | fOldMousePos | |
bool | fPaint | |
TQtWidgetBuffer* | fPixmapID | Double buffer of this widget |
TQtWidgetBuffer* | fPixmapScreen | Double buffer for no-double buffer operation |
QString | fSaveFormat | |
bool | fSizeChanged | |
QSize | fSizeHint | |
QWidget* | fWrapper | |
private:
UInt_t | fBits | bit field status word |
bool | fNeedStretch | |
Class Charts
Function documentation
TApplication * InitRint(Bool_t prompt = kFALSE, const char* appClassName = "QtRint", int* argc = 0, char** argv = 0, void* options = 0, int numOptions = 0, Bool_t noLogo = kTRUE)
Instantiate ROOT from within Qt application if needed
Return the TRint pointer
Most parametrs are passed to TRint class ctor
Bool_t prompt = kTRUE; Instantiate ROOT with ROOT command prompt
kFALSE; No ROOT prompt. The default for Qt GUI applications
The prompt option can be defined via ROOT parameter file ".rootrc"
.rootrc:
. . .
Gui.Prompt yes
void Erase()
Erases the entire widget and its double buffer
void cd()
[slot] to make this embedded canvas the current one
void cd(int subpadnumber)
[slot] to make this embedded canvas / pad the current one
void Disconnect()
[slot] Disconnect the Qt widget from TCanvas object before deleting
to avoid the dead lock
one has to set CanvasID = 0 to disconnect things properly.
customEvent(QCustomEvent* )
The custom response to the special WIN32 events
These events are not present with X11 systems
void contextMenuEvent(QContextMenuEvent* )
The custom response to the Qt QContextMenuEvent
Map QContextMenuEvent to the ROOT kButton3Down = 3 event
void focusInEvent(QFocusEvent* )
The custom response to the Qt QFocusEvent "in"
this imposes an extra protection to avoid TObject interaction with
mouse event accidently
void focusOutEvent(QFocusEvent* )
The custom response to the Qt QFocusEvent "out"
this imposes an extra protection to avoid TObject interaction with
mouse event accidently
void mousePressEvent(QMouseEvent* )
Map the Qt mouse press button event to the ROOT TCanvas events
Mouse events occur when a mouse button is pressed or released inside
a widget or when the mouse cursor is moved.
void mouseMoveEvent(QMouseEvent* )
Map the Qt mouse move pointer event to the ROOT TCanvas events
kMouseMotion = 51,
kButton1Motion = 21, kButton2Motion = 22, kButton3Motion = 23, kKeyPress = 24
void mouseReleaseEvent(QMouseEvent* )
Map the Qt mouse button release event to the ROOT TCanvas events
kButton1Up = 11, kButton2Up = 12, kButton3Up = 13
void enterEvent(QEvent* )
Map the Qt mouse enters widget event to the ROOT TCanvas events
kMouseEnter = 52
void leaveEvent(QEvent* )
Map the Qt mouse leaves widget event to the ROOT TCanvas events
kMouseLeave = 53
void resizeEvent(QResizeEvent* )
The widget will be erased and receive a paint event immediately after
processing the resize event.
No drawing need be (or should be) done inside this handler.
void SetSaveFormat(const char* format)
Set the default save format for the widget
bool Save(const char *fileName)
TQtWidget::Save(const QString &fileName) is a public Qt slot.
it saves the double buffer of this object using the default save
format defined the file extension
If the "fileName" has no extension the "default" format is to be used instead
The deafult format is "PNG".
It can be changed with the TQtWidget::SetSaveFormat method
bool Save(const QString &fileName)
TQtWidget::Save(const QString &fileName) is a public Qt slot.
it saves the double buffer of this object using the default save
format defined the file extension
If the "fileName" has no extension the "default" format is to be used instead
The deafult format is "PNG".
It can be changed with the TQtWidget::SetSaveFormat method
bool Save(const char *fileName,const char *format,int quality)
bool Save(const QString &fileName,const char *format,int quality)
TQtWidget::save is a public Qt slot.
it saves the double buffer of this object using QPixmap facility
void stretchWidget(QResizeEvent* e)
Stretch the widget during sizing
bool paintFlag(bool mode = TRUE)
Set new fPaint flag
Returns: the previous version of the flag
void showEvent(QShowEvent* )
Custom handler of the Qt show event
Non-spontaneous show events are sent to widgets immediately before
they are shown.
The spontaneous show events of top-level widgets are delivered afterwards.
void paintEvent(QPaintEvent* )
Custom handler of the Qt paint event
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.
void SetSizeHint(const QSize& size)
sets the preferred size of the widget.
QSize sizeHint() const
returns the preferred size of the widget.
QSize minimumSizeHint() const
returns the smallest size the widget can have.
QSizePolicy sizePolicy() const
returns a QSizePolicy; a value describing the space requirements
TQtWidgetBuffer & SetBuffer()
Create (if needed) and return the buffer
void operator=(const TQtWidget& )
----- Private bits, clients can only test but not change them