splittree.cpp

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

/////////////////////////////////////////////////////////////////////////////
// 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 1.35 2005/09/23 12:47:48 MR Exp $
// Copyright:   (c) Julian Smart
// Licence:     wxWindows licence
/////////////////////////////////////////////////////////////////////////////

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

// ----------------------------------------------------------------------------
// headers
// ----------------------------------------------------------------------------

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

#ifdef __BORLANDC__
    #pragma hdrstop
#endif

// for all others, include the necessary headers (this file is usually all you
// need because it includes almost all "standard" wxWidgets headers)
#ifndef WX_PRECOMP
    #include "wx/wx.h"
#endif

#ifdef __WXMSW__
#include <windows.h>
#include "wx/msw/winundef.h"
#endif

#include "wx/gizmos/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_PAINT(wxRemotelyScrolledTreeCtrl::OnPaint)
    EVT_TREE_ITEM_EXPANDED(wxID_ANY, wxRemotelyScrolledTreeCtrl::OnExpand)
    EVT_TREE_ITEM_COLLAPSED(wxID_ANY, 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 & ~wxTR_ROW_LINES)
{
    m_companionWindow = NULL;

    // We draw the row lines ourself so they match what's done
    // by the companion window.  That is why the flag is turned
    // off above, so wxGenericTreeCtrl doesn't draw them in a
    // different colour.
    m_drawRowLines = (style & wxTR_ROW_LINES) != 0;
}

wxRemotelyScrolledTreeCtrl::~wxRemotelyScrolledTreeCtrl()
{
}

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

// 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(
                                                #if USE_GENERIC_TREECTRL || !defined(__WXMSW__)
                                                  int pixelsPerUnitX, int pixelsPerUnitY,
                             int noUnitsX, int noUnitsY,
                             int xPos, int yPos,
                                                  bool noRefresh
                                                #else
                                                  int WXUNUSED(pixelsPerUnitX), int WXUNUSED(pixelsPerUnitY),
                                                  int WXUNUSED(noUnitsX), int WXUNUSED(noUnitsY),
                                                  int WXUNUSED(xPos), int WXUNUSED(yPos),
                                                  bool WXUNUSED(noRefresh)
                                                #endif
                                              )
{
#if USE_GENERIC_TREECTRL || !defined(__WXMSW__)
    if (IsKindOf(CLASSINFO(wxGenericTreeCtrl)))
    {
        wxGenericTreeCtrl* win = (wxGenericTreeCtrl*) this;
        win->wxGenericTreeCtrl::SetScrollbars(pixelsPerUnitX, pixelsPerUnitY, noUnitsX, 0, xPos, 0, /* noRefresh */ true);

        wxScrolledWindow* scrolledWindow = GetScrolledWindow();
        if (scrolledWindow)
        {
            scrolledWindow->SetScrollbars(0, pixelsPerUnitY, 0, noUnitsY, 0, yPos, noRefresh);
        }
    }
#endif
}

// In case we're using the generic tree control.
int wxRemotelyScrolledTreeCtrl::GetScrollPos(
                                             #if USE_GENERIC_TREECTRL || !defined(__WXMSW__)
                                                 int orient
                                             #else
                                                 int WXUNUSED(orient)
                                             #endif
                                             ) const
{

#if USE_GENERIC_TREECTRL || !defined(__WXMSW__)
    // this condition fixes extsitence of warning but
    wxScrolledWindow* scrolledWindow =
    // but GetScrolledWindow is still executed in case internally does something
#endif
                                       GetScrolledWindow();

#if USE_GENERIC_TREECTRL || !defined(__WXMSW__)
    if (IsKindOf(CLASSINFO(wxGenericTreeCtrl)))
    {
        wxGenericTreeCtrl* win = (wxGenericTreeCtrl*) this;

        if (orient == wxHORIZONTAL)
            return win->wxGenericTreeCtrl::GetScrollPos(orient);
        else
        {
            return scrolledWindow->GetScrollPos(orient);
        }
    }
#endif
    return 0;
}


// In case we're using the generic tree control.
// Get the view start
void wxRemotelyScrolledTreeCtrl::GetViewStart(int *x, int *y) const
{
    wxScrolledWindow* scrolledWindow = GetScrolledWindow();

#if USE_GENERIC_TREECTRL || !defined(__WXMSW__)
    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
#endif
    {
        // 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(
                                            #if USE_GENERIC_TREECTRL || !defined(__WXMSW__)
                                                wxDC& dc
                                            #else
                                                wxDC& WXUNUSED(dc)
                                            #endif
                                           )
{
#if USE_GENERIC_TREECTRL || !defined(__WXMSW__)
    if (IsKindOf(CLASSINFO(wxGenericTreeCtrl)))
    {
        wxScrolledWindow* 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() );
    }
#endif
}

// Scroll to the given line (in scroll units where each unit is
// the height of an item)
void wxRemotelyScrolledTreeCtrl::ScrollToLine(int WXUNUSED(posHoriz), int posVert)
{
#ifdef __WXMSW__
#if USE_GENERIC_TREECTRL
    if (!IsKindOf(CLASSINFO(wxGenericTreeCtrl)))
#endif // USE_GENERIC_TREECTRL
    {
        UINT sbCode = SB_THUMBPOSITION;
        HWND vertScrollBar = 0;
        MSWDefWindowProc((WXUINT) WM_VSCROLL, MAKELONG(sbCode, posVert), (WXLPARAM) vertScrollBar);
    }
#if USE_GENERIC_TREECTRL
    else
#endif // USE_GENERIC_TREECTRL
#endif // __WXMSW__
#if USE_GENERIC_TREECTRL || !defined(__WXMSW__)
    {
        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);
        }
        */
    }
#endif // USE_GENERIC_TREECTRL || !defined(__WXMSW__)
    wxUnusedVar(posVert);
}

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);
}

void wxRemotelyScrolledTreeCtrl::OnPaint(wxPaintEvent& event)
{
    wxPaintDC dc(this);

    wxTreeCtrl::OnPaint(event);

    if (! m_drawRowLines)
        return;

    // Reset the device origin since it may have been set
    dc.SetDeviceOrigin(0, 0);

    wxPen pen(wxSystemSettings::GetColour(wxSYS_COLOUR_3DLIGHT), 1, wxSOLID);
    dc.SetPen(pen);
    dc.SetBrush(* wxTRANSPARENT_BRUSH);

    wxSize clientSize = GetClientSize();
    wxRect itemRect;
    wxTreeItemId h, lastH;
    for (h=GetFirstVisibleItem();
         h.IsOk();
         h=GetNextVisible(h))
    {
        if (GetBoundingRect(h, itemRect))
        {
            int cy = itemRect.GetTop();
            dc.DrawLine(0, cy, clientSize.x, cy);
            lastH = h;
        }
        if (! IsVisible(h))
            break;
    }
    if (lastH.IsOk() && GetBoundingRect(lastH, itemRect))
    {
        int cy = itemRect.GetBottom();
        dc.DrawLine(0, cy, clientSize.x, cy);
    }
}


// Adjust the containing wxScrolledWindow's scrollbars appropriately
void wxRemotelyScrolledTreeCtrl::AdjustRemoteScrollbars()
{
#if USE_GENERIC_TREECTRL || !defined(__WXMSW__)
    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
#endif
    {
        // This is for the wxMSW tree control
        wxScrolledWindow* scrolledWindow = GetScrolledWindow();
        if (scrolledWindow)
        {
            wxRect itemRect;
            if (GetBoundingRect(GetFirstVisibleItem(), 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