splittree.cpp

ecos实时嵌入式操作系统

/////////////////////////////////////////////////////////////////////////////
// Name:        splittree.cpp
// Purpose:     Classes to achieve a remotely-scrolled tree in a splitter
//              window that can be scrolled by a scrolled window higher in the
//              hierarchy
// Author:      Julian Smart
// Modified by:
// Created:     8/7/2000
// RCS-ID:      $Id: splittree.cpp,v 1.9 2002/02/28 18:30:35 julians Exp $
// Copyright:   (c) Julian Smart
//
// This program is part of the eCos host tools.
//
// This program is free software; you can redistribute it and/or modify it
// under the terms of the GNU General Public License as published by the Free
// Software Foundation; either version 2 of the License, or (at your option)
// any later version.
//
// This program is distributed in the hope that it will be useful, but WITHOUT
// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
// FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
// more details.
//
// You should have received a copy of the GNU General Public License along with
// this program; if not, write to the Free Software Foundation, Inc.,
// 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
//
/////////////////////////////////////////////////////////////////////////////

// ============================================================================
// declarations
// ============================================================================

// ----------------------------------------------------------------------------
// headers
// ----------------------------------------------------------------------------
#ifdef __GNUG__
#pragma implementation "splittree.h"
#endif

// For compilers that support precompilation, includes "wx/wx.h".
#include "ecpch.h"

#ifdef __WXMSW__
#include "wx/msw/private.h"
#endif

#ifdef __BORLANDC__
#pragma hdrstop
#endif

#include "wx/generic/treectlg.h"

#include "splittree.h"
#include <math.h>

/*
* wxRemotelyScrolledTreeCtrl
*/

#if USE_GENERIC_TREECTRL
IMPLEMENT_CLASS(wxRemotelyScrolledTreeCtrl, wxGenericTreeCtrl)
#else
IMPLEMENT_CLASS(wxRemotelyScrolledTreeCtrl, wxTreeCtrl)
#endif

#if USE_GENERIC_TREECTRL
BEGIN_EVENT_TABLE(wxRemotelyScrolledTreeCtrl, wxGenericTreeCtrl)
#else
BEGIN_EVENT_TABLE(wxRemotelyScrolledTreeCtrl, wxTreeCtrl)
#endif
EVT_SIZE(wxRemotelyScrolledTreeCtrl::OnSize)
EVT_TREE_ITEM_EXPANDED(-1, wxRemotelyScrolledTreeCtrl::OnExpand)
EVT_TREE_ITEM_COLLAPSED(-1, wxRemotelyScrolledTreeCtrl::OnExpand)
EVT_SCROLLWIN(wxRemotelyScrolledTreeCtrl::OnScroll)
END_EVENT_TABLE()

wxRemotelyScrolledTreeCtrl::wxRemotelyScrolledTreeCtrl(wxWindow* parent, wxWindowID id, const wxPoint& pt,
                                                       const wxSize& sz, long style):
    wxTreeCtrl(parent, id, pt, sz, style
#if wxVERSION_NUMBER > 2301
	       & ~wxTR_ROW_LINES
#endif
	       )
{
    m_companionWindow = NULL;
}

wxRemotelyScrolledTreeCtrl::~wxRemotelyScrolledTreeCtrl()
{
}

void wxRemotelyScrolledTreeCtrl::HideVScrollbar()
{
#ifdef __WXMSW__
    if (!IsKindOf(CLASSINFO(wxGenericTreeCtrl)))
    {
        ::ShowScrollBar((HWND) GetHWND(), SB_VERT, FALSE);
    }
    else
#endif
    {
        // Implicit in overriding SetScrollbars
    }
}

// Number of pixels per user unit (0 or -1 for no scrollbar)
// Length of virtual canvas in user units
// Length of page in user units
void wxRemotelyScrolledTreeCtrl::SetScrollbars(int pixelsPerUnitX, int pixelsPerUnitY,
                                               int noUnitsX, int noUnitsY,
                                               int xPos, int yPos,
                                               bool noRefresh)
{
    if (IsKindOf(CLASSINFO(wxGenericTreeCtrl)))
    {
        wxGenericTreeCtrl* win = (wxGenericTreeCtrl*) this;
        // Pass TRUE for noRefresh so that it doesn't
        // draw part of the tree as if the scroll view is
        // at zero vertically.
        win->wxGenericTreeCtrl::SetScrollbars(pixelsPerUnitX, pixelsPerUnitY, noUnitsX, 0, xPos, 0, /* noRefresh */ TRUE);
        
        ecScrolledWindow* scrolledWindow = GetScrolledWindow();
        if (scrolledWindow)
        {
            scrolledWindow->SetScrollbars(0, pixelsPerUnitY, 0, noUnitsY, 0, yPos, noRefresh);
        }
    }
}

// In case we're using the generic tree control.
int wxRemotelyScrolledTreeCtrl::GetScrollPos(int orient) const
{
    ecScrolledWindow* scrolledWindow = GetScrolledWindow();
    
    if (IsKindOf(CLASSINFO(wxGenericTreeCtrl)))
    {
        wxGenericTreeCtrl* win = (wxGenericTreeCtrl*) this;
        
        if (orient == wxHORIZONTAL)
            return win->wxGenericTreeCtrl::GetScrollPos(orient);
        else
        {
            return scrolledWindow->GetScrollPos(orient);
        }
    }
    return 0;
}


// In case we're using the generic tree control.
// Get the view start
void wxRemotelyScrolledTreeCtrl::GetViewStart(int *x, int *y) const
{
    ecScrolledWindow* scrolledWindow = GetScrolledWindow();
    
    if (IsKindOf(CLASSINFO(wxGenericTreeCtrl)))
    {
        
        wxGenericTreeCtrl* win = (wxGenericTreeCtrl*) this;
        int x1, y1, x2, y2;
        win->wxGenericTreeCtrl::GetViewStart(& x1, & y1);
        * x = x1; * y = y1;
        if (!scrolledWindow)
            return;
        
        scrolledWindow->GetViewStart(& x2, & y2);
        * y = y2;
    }
    else
    {
        // x is wrong since the horizontal scrollbar is controlled by the
        // tree control, but we probably don't need it.
        scrolledWindow->GetViewStart(x, y);
    }
}

// In case we're using the generic tree control.
void wxRemotelyScrolledTreeCtrl::PrepareDC(wxDC& dc)
{
    if (IsKindOf(CLASSINFO(wxGenericTreeCtrl)))
    {
        ecScrolledWindow* scrolledWindow = GetScrolledWindow();
        
        wxGenericTreeCtrl* win = (wxGenericTreeCtrl*) this;
        
        int startX, startY;
        GetViewStart(& startX, & startY);
        
        int xppu1, yppu1, xppu2, yppu2;
        win->wxGenericTreeCtrl::GetScrollPixelsPerUnit(& xppu1, & yppu1);
        scrolledWindow->GetScrollPixelsPerUnit(& xppu2, & yppu2);
        
        dc.SetDeviceOrigin( -startX * xppu1, -startY * yppu2 );
        // dc.SetUserScale( win->GetScaleX(), win->GetScaleY() );
    }
}

// Scroll to the given line (in scroll units where each unit is
// the height of an item)
void wxRemotelyScrolledTreeCtrl::ScrollToLine(int posHoriz, int posVert)
{
#ifdef __WXMSW__
    if (!IsKindOf(CLASSINFO(wxGenericTreeCtrl)))
    {
        UINT sbCode = SB_THUMBPOSITION;
        HWND vertScrollBar = 0;
        MSWDefWindowProc((WXUINT) WM_VSCROLL, MAKELONG(sbCode, posVert), (WXHWND) vertScrollBar);
    }
    else
#endif
    {
        wxGenericTreeCtrl* win = (wxGenericTreeCtrl*) this;
        win->Refresh();
        /* Doesn't work yet because scrolling is ignored by Scroll
        int xppu, yppu;
        wxScrolledWindow* scrolledWindow = GetScrolledWindow();
        if (scrolledWindow)
        {
        scrolledWindow->GetScrollPixelsPerUnit(& xppu, & yppu);
        win->Scroll(-1, posVert*yppu);
        }
        */
    }
}

void wxRemotelyScrolledTreeCtrl::OnSize(wxSizeEvent& event)
{
    HideVScrollbar();
    AdjustRemoteScrollbars();
    event.Skip();
}

void wxRemotelyScrolledTreeCtrl::OnExpand(wxTreeEvent& event)
{
    AdjustRemoteScrollbars();
    event.Skip();
    
    // If we don't have this, we get some bits of lines still remaining
    if (event.GetEventType() == wxEVT_COMMAND_TREE_ITEM_COLLAPSED)
        Refresh();
    
    // Pass on the event
    if (m_companionWindow)
        m_companionWindow->GetEventHandler()->ProcessEvent(event);
}

// Adjust the containing wxScrolledWindow's scrollbars appropriately
void wxRemotelyScrolledTreeCtrl::AdjustRemoteScrollbars()
{
    if (IsKindOf(CLASSINFO(wxGenericTreeCtrl)))
    {
        // This is for the generic tree control.
        // It calls SetScrollbars which has been overridden
        // to adjust the parent scrolled window vertical
        // scrollbar.
        ((wxGenericTreeCtrl*) this)->AdjustMyScrollbars();
        return;
    }
    else
    {
        // This is for the wxMSW tree control
        ecScrolledWindow* scrolledWindow = GetScrolledWindow();
        if (scrolledWindow)
        {
            wxRect itemRect;
            if (GetBoundingRect(GetRootItem(), itemRect))
            {
                // Actually, the real height seems to be 1 less than reported
                // (e.g. 16 instead of 16)
                int itemHeight = itemRect.GetHeight() - 1;
                
                int w, h;
                GetClientSize(&w, &h);
                
                wxRect rect(0, 0, 0, 0);
                CalcTreeSize(rect);
                
                double f = ((double) (rect.GetHeight()) / (double) itemHeight)  ;
                int treeViewHeight = (int) ceil(f);
                
                int scrollPixelsPerLine = itemHeight;
                int scrollPos = - (itemRect.y / itemHeight);
                
                scrolledWindow->SetScrollbars(0, scrollPixelsPerLine, 0, treeViewHeight, 0, scrollPos);
                
                // Ensure that when a scrollbar becomes hidden or visible,
                // the contained window sizes are right.
                // Problem: this is called too early (?)
                wxSizeEvent event(scrolledWindow->GetSize(), scrolledWindow->GetId());
                scrolledWindow->GetEventHandler()->ProcessEvent(event);
            }
        }
    }
}


// Calculate the area that contains both rectangles
static wxRect CombineRectangles(const wxRect& rect1, const wxRect& rect2)
{
    wxRect rect;
    
    int right1 = rect1.GetRight();
    int bottom1 = rect1.GetBottom();
    int right2 = rect2.GetRight();
    int bottom2 = rect2.GetBottom();
    
    wxPoint topLeft = wxPoint(wxMin(rect1.x, rect2.x), wxMin(rect1.y, rect2.y));
    wxPoint bottomRight = wxPoint(wxMax(right1, right2), wxMax(bottom1, bottom2));
    
    rect.x = topLeft.x; rect.y = topLeft.y;
    rect.SetRight(bottomRight.x);
    rect.SetBottom(bottomRight.y);
    
    return rect;
}


// Calculate the tree overall size so we can set the scrollbar
// correctly

// static int g_count = 0;

void wxRemotelyScrolledTreeCtrl::CalcTreeSize(wxRect& rect)
{
    //    g_count = 0;
    CalcTreeSize(GetRootItem(), rect);
}

void wxRemotelyScrolledTreeCtrl::CalcTreeSize(const wxTreeItemId& id, wxRect& rect)
{
    // More efficient implementation would be to find the last item (but how?)
    // Q: is the bounding rect relative to the top of the virtual tree workspace