view.cpp

wxGTK 是 wxWidgets 的 linux GTK+ (>2.2.3)版本。wxWidgets 是一个跨平台的 GUI 框架

// Generalised command
void csDiagramView::DoCmd(wxList& shapes, wxList& oldShapes, int cmd, const wxString& op)
{
    csDiagramDocument *doc = (csDiagramDocument *)GetDocument();

    if (shapes.GetCount() > 0)
    {
        csDiagramCommand* command = new csDiagramCommand(op, doc);

        wxObjectList::compatibility_iterator node = shapes.GetFirst();
        wxObjectList::compatibility_iterator node1 = oldShapes.GetFirst();
        while (node && node1)
        {
            wxShape *theShape = (wxShape*) node->GetData();
            wxShape *oldShape = (wxShape*) node1->GetData();
            csCommandState* state = new csCommandState(cmd, theShape, oldShape);
            command->AddState(state);

            node = node->GetNext();
            node1 = node1->GetNext();
        }
        doc->GetCommandProcessor()->Submit(command);
    }
}

void csDiagramView::OnChangeBackgroundColour(wxCommandEvent& WXUNUSED(event))
{
    csDiagramDocument *doc = (csDiagramDocument *)GetDocument();

    wxList selections;
    FindSelectedShapes(selections);

    if (selections.GetCount() > 0)
    {
        wxColourData data;
        data.SetChooseFull(true);
        if (selections.GetCount() == 1)
        {
            wxShape* firstShape = (wxShape*) selections.GetFirst()->GetData();
            data.SetColour(firstShape->GetBrush()->GetColour());
        }

        wxColourDialog *dialog = new wxColourDialog(frame, &data);
        wxBrush *theBrush = NULL;
        if (dialog->ShowModal() == wxID_OK)
        {
          wxColourData retData = dialog->GetColourData();
          wxColour col = retData.GetColour();
          theBrush = wxTheBrushList->FindOrCreateBrush(col, wxSOLID);
        }
        dialog->Close(true);
        if (!theBrush)
            return;

        csDiagramCommand* cmd = new csDiagramCommand(_T("Change colour"), doc);

        wxObjectList::compatibility_iterator node = selections.GetFirst();
        while (node)
        {
            wxShape *theShape = (wxShape*) node->GetData();
            wxShape* newShape = theShape->CreateNewCopy();
            newShape->SetBrush(theBrush);

            csCommandState* state = new csCommandState(ID_CS_CHANGE_BACKGROUND_COLOUR, newShape, theShape);
            cmd->AddState(state);

            node = node->GetNext();
        }
        doc->GetCommandProcessor()->Submit(cmd);
    }
}

void csDiagramView::OnEditProperties(wxCommandEvent& WXUNUSED(event))
{
      wxShape *theShape = FindFirstSelectedShape();
      if (theShape)
        ((csEvtHandler *)theShape->GetEventHandler())->EditProperties();
}

void csDiagramView::OnEditPropertiesUpdate(wxUpdateUIEvent& event)
{
    wxList selections;
    FindSelectedShapes(selections);
    event.Enable( (selections.GetCount() > 0) );
}

void csDiagramView::OnPointSizeComboSel(wxCommandEvent& event)
{
    wxComboBox* combo = (wxComboBox*) event.GetEventObject();
    wxASSERT( combo != NULL );

    int newPointSize = (combo->GetSelection() + 1);

    ApplyPointSize(newPointSize);

}

// TODO: must find out how to intercept the Return key, rather than
// every key stroke. But for now, do every key stroke.
void csDiagramView::OnPointSizeComboText(wxCommandEvent& event)
{
    wxComboBox* combo = (wxComboBox*) event.GetEventObject();
    wxASSERT( combo != NULL );

    wxString str(combo->GetValue());
    long newPointSize;
    str.ToLong( &newPointSize );

    if (newPointSize < 2)
        return;

    ApplyPointSize(newPointSize);
}

void csDiagramView::ApplyPointSize(int pointSize)
{
    csDiagramDocument *doc = (csDiagramDocument *)GetDocument();

    wxList selections;
    FindSelectedShapes(selections);

    if (selections.GetCount() > 0)
    {
        csDiagramCommand* cmd = new csDiagramCommand(_T("Point size"), doc);

        wxObjectList::compatibility_iterator node = selections.GetFirst();
        while (node)
        {
            wxShape *theShape = (wxShape*) node->GetData();
            wxShape *newShape = theShape->CreateNewCopy();

            wxFont* newFont = wxTheFontList->FindOrCreateFont(pointSize,
                theShape->GetFont()->GetFamily(),
                theShape->GetFont()->GetStyle(),
                theShape->GetFont()->GetWeight(),
                theShape->GetFont()->GetUnderlined(),
                theShape->GetFont()->GetFaceName());

            newShape->SetFont(newFont);

            csCommandState* state = new csCommandState(ID_CS_FONT_CHANGE, newShape, theShape);

            cmd->AddState(state);

            node = node->GetNext();
        }
        doc->GetCommandProcessor()->Submit(cmd);
    }
}

void csDiagramView::OnZoomSel(wxCommandEvent& event)
{
    int maxZoom = 200;
    int minZoom = 5;
    int inc = 5;
    int noStrings = (maxZoom - minZoom)/inc ;

    wxComboBox* combo = (wxComboBox*) event.GetEventObject();
    wxASSERT( combo != NULL );

    int scale = (int) ((noStrings - combo->GetSelection() - 1)*inc + minZoom);

    canvas->SetScale((double) (scale/100.0), (double) (scale/100.0));
    canvas->Refresh();
}

// Select or deselect all
void csDiagramView::SelectAll(bool select)
{
    wxClientDC dc(canvas);
    canvas->PrepareDC(dc);

    if (!select)
    {
        wxList selections;
        FindSelectedShapes(selections);

        wxObjectList::compatibility_iterator node = selections.GetFirst();
        while (node)
        {
            wxShape *theShape = (wxShape*) node->GetData();
            theShape->Select(false, &dc);
            SelectShape(theShape, false);

            node = node->GetNext();
        }
    }
    else
    {
        csDiagramDocument *doc = (csDiagramDocument *)GetDocument();
        wxObjectList::compatibility_iterator node = doc->GetDiagram()->GetShapeList()->GetFirst();
        while (node)
        {
            wxShape *eachShape = (wxShape *)node->GetData();
            if (eachShape->GetParent() == NULL &&
                !eachShape->IsKindOf(CLASSINFO(wxControlPoint)) &&
                !eachShape->IsKindOf(CLASSINFO(wxLabelShape)))
            {
                eachShape->Select(true, &dc);
                SelectShape(eachShape, true);
            }
            node = node->GetNext();
        }
    }
}


void csDiagramView::OnToggleArrowTool(wxCommandEvent& WXUNUSED(event))
{
    csDiagramDocument *doc = (csDiagramDocument *)GetDocument();

    bool state = wxGetApp().GetDiagramToolBar()->GetToolState(DIAGRAM_TOOLBAR_LINE_ARROW);
    wxString stateName;
    if (state)
        stateName = _T("Arrow on");
    else
        stateName = _T("Arrow off");

    wxList selections;
    FindSelectedShapes(selections, CLASSINFO(wxLineShape));

    if (selections.GetCount() > 0)
    {
        csDiagramCommand* cmd = new csDiagramCommand(stateName, doc);

        wxObjectList::compatibility_iterator node = selections.GetFirst();
        while (node)
        {
            wxLineShape *theShape = (wxLineShape*) node->GetData();
            wxLineShape *newShape = NULL;

            if (state)
            {
                // Add arrow
                if (theShape->GetArrows().GetCount() == 0)
                {
                    newShape = (wxLineShape*) theShape->CreateNewCopy();
                    newShape->AddArrow(ARROW_ARROW, ARROW_POSITION_MIDDLE, 10.0, 0.0, _T("Normal arrowhead"));
                }
            }
            else
            {
                if (theShape->GetArrows().GetCount() > 0)
                {
                    newShape = (wxLineShape*) theShape->CreateNewCopy();
                    newShape->ClearArrowsAtPosition();
                }
            }

            // If the new state is the same as the old, don't bother adding it to the command state.
            if (newShape)
            {
                csCommandState* state = new csCommandState(ID_CS_ARROW_CHANGE, newShape, theShape);
                cmd->AddState(state);
            }

            node = node->GetNext();
        }
        doc->GetCommandProcessor()->Submit(cmd);
    }
}

void csDiagramView::OnToggleArrowToolUpdate(wxUpdateUIEvent& event)
{
    wxList selections;
    FindSelectedShapes(selections, CLASSINFO(wxLineShape));
    event.Enable( (selections.GetCount() > 0) );
}

// Make the point size combobox reflect this
void csDiagramView::ReflectPointSize(int pointSize)
{
    wxComboBox* comboBox = wxGetApp().GetPointSizeComboBox();
    comboBox->SetSelection(pointSize -1);
}

// Make the arrow toggle button reflect the state of the line
void csDiagramView::ReflectArrowState(wxLineShape* lineShape)
{
    bool haveArrow = false;
    wxObjectList::compatibility_iterator node = lineShape->GetArrows().GetFirst();
    while (node)
    {
      wxArrowHead *arrow = (wxArrowHead *)node->GetData();
      if (ARROW_POSITION_MIDDLE == arrow->GetArrowEnd())
        haveArrow = true;
      node = node->GetNext();
    }

    wxGetApp().GetDiagramToolBar()->ToggleTool(DIAGRAM_TOOLBAR_LINE_ARROW, haveArrow);
}

void csDiagramView::OnAlign(wxCommandEvent& event)
{
    // Make a copy of the selections, keeping only those shapes
    // that are top-level non-line shapes.
    wxList selections;
    wxObjectList::compatibility_iterator node = GetSelectionList().GetFirst();
    while (node)
    {
        wxShape* shape = (wxShape*) node->GetData();
        if ((shape->GetParent() == NULL) && (!shape->IsKindOf(CLASSINFO(wxLineShape))))
        {
            selections.Append(shape);
        }
        node = node->GetNext();
    }

    if (selections.GetCount() == 0)
        return;

    csDiagramDocument *doc = (csDiagramDocument *)GetDocument();
    csDiagramCommand* cmd = new csDiagramCommand(_T("Align"), doc);

    node = selections.GetFirst();
    wxShape* firstShape = (wxShape*) node->GetData();

    double x = firstShape->GetX();
    double y = firstShape->GetY();
    double width, height;
    firstShape->GetBoundingBoxMax(&width, &height);

    node = selections.GetFirst();
    while (node)
    {
        wxShape* shape = (wxShape*) node->GetData();
        if (shape != firstShape)
        {
            /* double x1 = */ shape->GetX();
            /* double y1 = */ shape->GetY();
            double width1, height1;
            shape->GetBoundingBoxMax(& width1, & height1);

            wxShape* newShape = shape->CreateNewCopy();

            switch (event.GetId())
            {
                case DIAGRAM_TOOLBAR_ALIGNL:
                {
                    double x2 = (double)(x - (width/2.0) + (width1/2.0));
                    newShape->SetX(x2);
                    break;
                }
                case DIAGRAM_TOOLBAR_ALIGNR:
                {
                    double x2 = (double)(x + (width/2.0) - (width1/2.0));