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259 lines
7.6 KiB
C++
259 lines
7.6 KiB
C++
//////////////////////////////////////////////////////////////////////////////
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// Name: wx/generic/dragimgg.h
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// Purpose: wxDragImage class: a kind of a cursor, that can cope
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// with more sophisticated images
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// Author: Julian Smart
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// Modified by:
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// Created: 29/2/2000
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// Copyright: (c) Julian Smart
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// Licence: wxWindows licence
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/////////////////////////////////////////////////////////////////////////////
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#ifndef _WX_DRAGIMGG_H_
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#define _WX_DRAGIMGG_H_
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#include "wx/bitmap.h"
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#include "wx/icon.h"
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#include "wx/cursor.h"
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#include "wx/treectrl.h"
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#include "wx/listctrl.h"
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#include "wx/log.h"
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#include "wx/overlay.h"
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/*
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To use this class, create a wxDragImage when you start dragging, for example:
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void MyTreeCtrl::OnBeginDrag(wxTreeEvent& event)
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{
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#ifdef __WXMSW__
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::UpdateWindow((HWND) GetHWND()); // We need to implement this in wxWidgets
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#endif
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CaptureMouse();
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m_dragImage = new wxDragImage(* this, itemId);
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m_dragImage->BeginDrag(wxPoint(0, 0), this);
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m_dragImage->Move(pt, this);
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m_dragImage->Show(this);
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...
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}
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In your OnMouseMove function, hide the image, do any display updating required,
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then move and show the image again:
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void MyTreeCtrl::OnMouseMove(wxMouseEvent& event)
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{
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if (m_dragMode == MY_TREE_DRAG_NONE)
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{
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event.Skip();
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return;
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}
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// Prevent screen corruption by hiding the image
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if (m_dragImage)
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m_dragImage->Hide(this);
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// Do some updating of the window, such as highlighting the drop target
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...
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#ifdef __WXMSW__
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if (updateWindow)
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::UpdateWindow((HWND) GetHWND());
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#endif
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// Move and show the image again
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m_dragImage->Move(event.GetPosition(), this);
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m_dragImage->Show(this);
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}
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Eventually we end the drag and delete the drag image.
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void MyTreeCtrl::OnLeftUp(wxMouseEvent& event)
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{
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...
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// End the drag and delete the drag image
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if (m_dragImage)
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{
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m_dragImage->EndDrag(this);
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delete m_dragImage;
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m_dragImage = NULL;
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}
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ReleaseMouse();
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}
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*/
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/*
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* wxGenericDragImage
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*/
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class WXDLLIMPEXP_CORE wxGenericDragImage: public wxObject
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{
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public:
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// Ctors & dtor
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////////////////////////////////////////////////////////////////////////////
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wxGenericDragImage(const wxCursor& cursor = wxNullCursor)
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{
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Init();
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Create(cursor);
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}
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wxGenericDragImage(const wxBitmap& image, const wxCursor& cursor = wxNullCursor)
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{
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Init();
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Create(image, cursor);
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}
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wxGenericDragImage(const wxIcon& image, const wxCursor& cursor = wxNullCursor)
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{
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Init();
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Create(image, cursor);
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}
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wxGenericDragImage(const wxString& str, const wxCursor& cursor = wxNullCursor)
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{
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Init();
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Create(str, cursor);
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}
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#if wxUSE_TREECTRL
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wxGenericDragImage(const wxTreeCtrl& treeCtrl, wxTreeItemId& id)
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{
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Init();
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Create(treeCtrl, id);
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}
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#endif
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#if wxUSE_LISTCTRL
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wxGenericDragImage(const wxListCtrl& listCtrl, long id)
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{
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Init();
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Create(listCtrl, id);
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}
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#endif
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virtual ~wxGenericDragImage();
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// Attributes
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////////////////////////////////////////////////////////////////////////////
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#ifdef wxHAS_NATIVE_OVERLAY
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// backing store is not used when native overlays are
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void SetBackingBitmap(wxBitmap* WXUNUSED(bitmap)) { }
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#else
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// For efficiency, tell wxGenericDragImage to use a bitmap that's already
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// created (e.g. from last drag)
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void SetBackingBitmap(wxBitmap* bitmap) { m_pBackingBitmap = bitmap; }
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#endif // wxHAS_NATIVE_OVERLAY/!wxHAS_NATIVE_OVERLAY
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// Operations
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////////////////////////////////////////////////////////////////////////////
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// Create a drag image with a virtual image (need to override DoDrawImage, GetImageRect)
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bool Create(const wxCursor& cursor = wxNullCursor);
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// Create a drag image from a bitmap and optional cursor
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bool Create(const wxBitmap& image, const wxCursor& cursor = wxNullCursor);
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// Create a drag image from an icon and optional cursor
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bool Create(const wxIcon& image, const wxCursor& cursor = wxNullCursor);
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// Create a drag image from a string and optional cursor
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bool Create(const wxString& str, const wxCursor& cursor = wxNullCursor);
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#if wxUSE_TREECTRL
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// Create a drag image for the given tree control item
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bool Create(const wxTreeCtrl& treeCtrl, wxTreeItemId& id);
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#endif
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#if wxUSE_LISTCTRL
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// Create a drag image for the given list control item
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bool Create(const wxListCtrl& listCtrl, long id);
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#endif
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// Begin drag. hotspot is the location of the drag position relative to the upper-left
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// corner of the image.
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bool BeginDrag(const wxPoint& hotspot, wxWindow* window, bool fullScreen = false, wxRect* rect = NULL);
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// Begin drag. hotspot is the location of the drag position relative to the upper-left
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// corner of the image. This is full screen only. fullScreenRect gives the
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// position of the window on the screen, to restrict the drag to.
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bool BeginDrag(const wxPoint& hotspot, wxWindow* window, wxWindow* fullScreenRect);
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// End drag
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bool EndDrag();
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// Move the image: call from OnMouseMove. Pt is in window client coordinates if window
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// is non-NULL, or in screen coordinates if NULL.
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bool Move(const wxPoint& pt);
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// Show the image
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bool Show();
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// Hide the image
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bool Hide();
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// Implementation
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////////////////////////////////////////////////////////////////////////////
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void Init();
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// Override this if you are using a virtual image (drawing your own image)
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virtual wxRect GetImageRect(const wxPoint& pos) const;
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// Override this if you are using a virtual image (drawing your own image)
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virtual bool DoDrawImage(wxDC& dc, const wxPoint& pos) const;
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// Override this if you wish to draw the window contents to the backing bitmap
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// yourself. This can be desirable if you wish to avoid flicker by not having to
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// redraw the window itself before dragging in order to be graphic-minus-dragged-objects.
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// Instead, paint the drag image's backing bitmap to be correct, and leave the window
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// to be updated only when dragging the objects away (thus giving a smoother appearance).
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virtual bool UpdateBackingFromWindow(wxDC& windowDC, wxMemoryDC& destDC,
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const wxRect& sourceRect, const wxRect& destRect) const;
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// Erase and redraw simultaneously if possible
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virtual bool RedrawImage(const wxPoint& oldPos, const wxPoint& newPos, bool eraseOld, bool drawNew);
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protected:
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wxBitmap m_bitmap;
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wxIcon m_icon;
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wxCursor m_cursor;
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wxCursor m_oldCursor;
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// wxPoint m_hotspot;
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wxPoint m_offset; // The hostpot value passed to BeginDrag
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wxPoint m_position;
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bool m_isDirty;
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bool m_isShown;
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wxWindow* m_window;
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wxDC* m_windowDC;
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#ifdef wxHAS_NATIVE_OVERLAY
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wxOverlay m_overlay;
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wxDCOverlay* m_dcOverlay;
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#else
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// Stores the window contents while we're dragging the image around
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wxBitmap m_backingBitmap;
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wxBitmap* m_pBackingBitmap; // Pointer to existing backing bitmap
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// (pass to wxGenericDragImage as an efficiency measure)
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// A temporary bitmap for repairing/redrawing
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wxBitmap m_repairBitmap;
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#endif // !wxHAS_NATIVE_OVERLAY
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wxRect m_boundingRect;
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bool m_fullScreen;
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private:
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wxDECLARE_DYNAMIC_CLASS(wxGenericDragImage);
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wxDECLARE_NO_COPY_CLASS(wxGenericDragImage);
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};
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#endif
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// _WX_DRAGIMGG_H_
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