Beispiel #1
0
void MyCanvas::DrawShapes(wxDC& dc)
{
    wxList::compatibility_iterator node = m_displayList.GetFirst();
    while (node)
    {
        DragShape* shape = (DragShape*) node->GetData();
        if (shape->IsShown())
          shape->Draw(dc);
        node = node->GetNext();
    }
}
Beispiel #2
0
void MyCanvas::DrawShapes(wxDC& dc)
{
    wxList::compatibility_iterator node = m_displayList.GetFirst();
    while (node)
    {
        DragShape* shape = (DragShape*) node->GetData();
        if (shape->IsShown() && m_draggedShape != shape)
        {
            shape->Draw(dc, (m_currentlyHighlighted == shape));
        }
        node = node->GetNext();
    }
}
Beispiel #3
0
void MyCanvas::OnMouseEvent(wxMouseEvent& event)
{
    if (event.LeftDown())
    {
        DragShape* shape = FindShape(event.GetPosition());
        if (shape)
        {
            // We tentatively start dragging, but wait for
            // mouse movement before dragging properly.

            m_dragMode = TEST_DRAG_START;
            m_dragStartPos = event.GetPosition();
            m_draggedShape = shape;
        }
    }
    else if (event.LeftUp() && m_dragMode != TEST_DRAG_NONE)
    {
        // Finish dragging

        m_dragMode = TEST_DRAG_NONE;

        if (!m_draggedShape || !m_dragImage)
            return;

        m_draggedShape->SetPosition(m_draggedShape->GetPosition()
                                    + event.GetPosition() - m_dragStartPos);

        m_dragImage->Hide();
        m_dragImage->EndDrag();
        delete m_dragImage;
        m_dragImage = NULL;

        wxClientDC dc(this);
        if (m_currentlyHighlighted)
        {
            m_currentlyHighlighted->Draw(dc);
        }
        m_draggedShape->SetShow(true);
        m_draggedShape->Draw(dc);

        m_currentlyHighlighted = (DragShape*) NULL;

        m_draggedShape = (DragShape*) NULL;
    }
    else if (event.Dragging() && m_dragMode != TEST_DRAG_NONE)
    {
        if (m_dragMode == TEST_DRAG_START)
        {
            // We will start dragging if we've moved beyond a couple of pixels

            int tolerance = 2;
            int dx = abs(event.GetPosition().x - m_dragStartPos.x);
            int dy = abs(event.GetPosition().y - m_dragStartPos.y);
            if (dx <= tolerance && dy <= tolerance)
                return;

            // Start the drag.
            m_dragMode = TEST_DRAG_DRAGGING;

            if (m_dragImage)
                delete m_dragImage;

            // Erase the dragged shape from the canvas
            m_draggedShape->SetShow(false);
            wxClientDC dc(this);
            EraseShape(m_draggedShape, dc);
            DrawShapes(dc);

            switch (m_draggedShape->GetDragMethod())
            {
                case SHAPE_DRAG_BITMAP:
                {
                    m_dragImage = new wxDragImage(m_draggedShape->GetBitmap(), wxCursor(wxCURSOR_HAND));
                    break;
                }
                case SHAPE_DRAG_TEXT:
                {
                    m_dragImage = new wxDragImage(wxString(_T("Dragging some test text")), wxCursor(wxCURSOR_HAND));
                    break;
                }
                case SHAPE_DRAG_ICON:
                {
                    m_dragImage = new wxDragImage(wxICON(dragicon), wxCursor(wxCURSOR_HAND));
                    break;
                }
            }

            bool fullScreen = wxGetApp().GetUseScreen();

            // The offset between the top-left of the shape image and the current shape position
            wxPoint beginDragHotSpot = m_dragStartPos - m_draggedShape->GetPosition();

            // Now we do this inside the implementation: always assume
            // coordinates relative to the capture window (client coordinates)

            //if (fullScreen)
            //    beginDragHotSpot -= ClientToScreen(wxPoint(0, 0));

            if (!m_dragImage->BeginDrag(beginDragHotSpot, this, fullScreen))
            {
                delete m_dragImage;
                m_dragImage = (wxDragImage*) NULL;
                m_dragMode = TEST_DRAG_NONE;

            } else
            {
                m_dragImage->Move(event.GetPosition());
                m_dragImage->Show();
            }
        }
        else if (m_dragMode == TEST_DRAG_DRAGGING)
        {
            // We're currently dragging. See if we're over another shape.
            DragShape* onShape = FindShape(event.GetPosition());

            bool mustUnhighlightOld = false;
            bool mustHighlightNew = false;

            if (m_currentlyHighlighted)
            {
                if ((onShape == (DragShape*) NULL) || (m_currentlyHighlighted != onShape))
                    mustUnhighlightOld = true;
            }

            if (onShape && (onShape != m_currentlyHighlighted) && onShape->IsShown())
                mustHighlightNew = true;

            if (mustUnhighlightOld || mustHighlightNew)
                m_dragImage->Hide();

            // Now with the drag image switched off, we can change the window contents.

            if (mustUnhighlightOld)
            {
                wxClientDC clientDC(this);
                m_currentlyHighlighted->Draw(clientDC);
                m_currentlyHighlighted = (DragShape*) NULL;
            }
            if (mustHighlightNew)
            {
                wxClientDC clientDC(this);
                m_currentlyHighlighted = onShape;
                m_currentlyHighlighted->Draw(clientDC, wxINVERT);
            }

            // Move and show the image again
            m_dragImage->Move(event.GetPosition());

            if (mustUnhighlightOld || mustHighlightNew)
                 m_dragImage->Show();
        }
    }
}