Quellcodebibliothek tracker.cxx Sprache: C

/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
* This file is part of the LibreOffice project.
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*
* This file incorporates work covered by the following license notice:
*
*   Licensed to the Apache Software Foundation (ASF) under one or more
*   contributor license agreements. See the NOTICE file distributed
*   with this work for additional information regarding copyright
*   ownership. The ASF licenses this file to you under the Apache
*   License, Version 2.0 (the "License"); you may not use this file
*   except in compliance with the License. You may obtain a copy of
*   the License at http://www.apache.org/licenses/LICENSE-2.0 .
*/

#include <sal/config.h>

#include <algorithm>

#include <sal/types.h>
#include <sal/log.hxx>

#include <stdafx.h>
#include <stddef.h>
#include <syswinwrapper.hxx>

// windowserrorstring.hxx includes postwin.h, which #undef OPAQUE, so "#redef" it
#include <comphelper/windowserrorstring.hxx>
#ifdef OPAQUE
#error OPAQUE should not be defined!?
#endif
#define OPAQUE 2

static HCURSOR afxCursors[10] = { nullptr, };
static HBRUSH afxHalftoneBrush = nullptr;

namespace {

// the struct below is used to determine the qualities of a particular handle
struct AFX_HANDLEINFO
{
    size_t nOffsetX;    // offset within RECT for X coordinate
    size_t nOffsetY;    // offset within RECT for Y coordinate
    int nCenterX;       // adjust X by Width()/2 * this number
    int nCenterY;       // adjust Y by Height()/2 * this number
    int nHandleX;       // adjust X by handle size * this number
    int nHandleY;       // adjust Y by handle size * this number
    int nInvertX;       // handle converts to this when X inverted
    int nInvertY;       // handle converts to this when Y inverted
};

}

// this array describes all 8 handles (clock-wise)
const AFX_HANDLEINFO afxHandleInfo[] =
{
    // corner handles (top-left, top-right, bottom-right, bottom-left
    { offsetof(RECT, left), offsetof(RECT, top),        0, 0,  0,  0, 1, 3 },
    { offsetof(RECT, right), offsetof(RECT, top),       0, 0, -1,  0, 0, 2 },
    { offsetof(RECT, right), offsetof(RECT, bottom),    0, 0, -1, -1, 3, 1 },
    { offsetof(RECT, left), offsetof(RECT, bottom),     0, 0,  0, -1, 2, 0 },

    // side handles (top, right, bottom, left)
    { offsetof(RECT, left), offsetof(RECT, top),        1, 0,  0,  0, 4, 6 },
    { offsetof(RECT, right), offsetof(RECT, top),       0, 1, -1,  0, 7, 5 },
    { offsetof(RECT, left), offsetof(RECT, bottom),     1, 0,  0, -1, 6, 4 },
    { offsetof(RECT, left), offsetof(RECT, top),        0, 1,  0,  0, 5, 7 }
};

namespace {

// the struct below gives us information on the layout of a RECT struct and
//  the relationship between its members
struct AFX_RECTINFO
{
    size_t nOffsetAcross;   // offset of opposite point (ie. left->right)
    int nSignAcross;        // sign relative to that point (ie. add/subtract)
};

}

// this array is indexed by the offset of the RECT member / sizeof(int)
const AFX_RECTINFO afxRectInfo[] =
{
    { offsetof(RECT, right), +1 },
    { offsetof(RECT, bottom), +1 },
    { offsetof(RECT, left), -1 },
    { offsetof(RECT, top), -1 },
};

static HBRUSH HalftoneBrush()
{
    if (afxHalftoneBrush == nullptr)
    {
        WORD grayPattern[8];
        for (int i = 0; i < 8; i++)
            grayPattern[i] = static_cast<WORD>(0x5555 << (i & 1));
        HBITMAP grayBitmap = CreateBitmap(8, 8, 1, 1, &grayPattern);
        if (grayBitmap != nullptr)
        {
            afxHalftoneBrush = CreatePatternBrush(grayBitmap);
            DeleteObject(grayBitmap);
        }
    }
    return afxHalftoneBrush;
}

static void DrawDragRect(
    HDC hDC,LPRECT lpRect,SIZE size,
    LPRECT lpRectLast,SIZE sizeLast,
    HBRUSH hBrush = nullptr,HBRUSH hBrushLast = nullptr)
{
    // first, determine the update region and select it
    HRGN rgnNew;
    HRGN rgnOutside,rgnInside;
    rgnOutside = CreateRectRgnIndirect(lpRect);
    RECT rect = *lpRect;
    InflateRect(&rect,-size.cx, -size.cy);
    IntersectRect(&rect,&rect,lpRect);
    rgnInside = CreateRectRgnIndirect(&rect);
    rgnNew = CreateRectRgn(0, 0, 0, 0);
    CombineRgn(rgnNew,rgnOutside,rgnInside,RGN_XOR);

    HBRUSH hBrushOld = nullptr;
    if (hBrush == nullptr)
        hBrush = HalftoneBrush();
    if (hBrushLast == nullptr)
        hBrushLast = hBrush;

    HRGN rgnLast(nullptr);
    HRGN rgnUpdate(nullptr);
    if (lpRectLast != nullptr)
    {
        // find difference between new region and old region
        rgnLast = CreateRectRgn(0, 0, 0, 0);
        SetRectRgn(
            rgnOutside,
            lpRectLast->left,
            lpRectLast->top,
            lpRectLast->right,
            lpRectLast->bottom);
        rect = *lpRectLast;
        InflateRect(&rect,-sizeLast.cx, -sizeLast.cy);
        IntersectRect(&rect,&rect, lpRectLast);
        SetRectRgn(rgnInside,rect.left,rect.top,rect.right,rect.bottom);
        CombineRgn(rgnLast,rgnOutside,rgnInside, RGN_XOR);

//      // only diff them if brushes are the same
        if (hBrush == hBrushLast)
        {
            rgnUpdate = CreateRectRgn(0, 0, 0, 0);
            CombineRgn(rgnUpdate,rgnLast,rgnNew, RGN_XOR);
        }
    }
    if (hBrush != hBrushLast && lpRectLast != nullptr)
    {
        // brushes are different -- erase old region first
        SelectClipRgn(hDC,rgnLast);
        GetClipBox(hDC,&rect);
        hBrushOld = static_cast<HBRUSH>(SelectObject(hDC,static_cast<HGDIOBJ>(hBrushLast)));
        PatBlt(hDC,rect.left,rect.top,(rect.right-rect.left),(rect.bottom-rect.top),PATINVERT);

        SelectObject(hDC,static_cast<HGDIOBJ>(hBrushOld));
        hBrushOld = nullptr;
    }

    // draw into the update/new region
    SelectClipRgn(hDC,rgnUpdate);

    GetClipBox(hDC,&rect);
    hBrushOld = static_cast<HBRUSH>(SelectObject(hDC, static_cast<HGDIOBJ>(hBrush)));
    PatBlt(hDC,rect.left, rect.top,(rect.right-rect.left),(rect.bottom-rect.top), PATINVERT);

    // cleanup DC
    if (hBrushOld != nullptr)
        SelectObject(hDC, static_cast<HGDIOBJ>(hBrushOld));
    SelectClipRgn(hDC,nullptr);
}

void winwrap::TransformRect(LPRECT rect,HWND pWnd,HWND pWndClipTo)
{
    POINT pt;
    pt.x = rect->left;pt.y = rect->top;
    ClientToScreen(pWnd,&pt);
    ScreenToClient(pWndClipTo,&pt);
    rect->left = pt.x; rect->top = pt.y;

    pt.x = rect->right;pt.y = rect->bottom;
    ClientToScreen(pWnd,&pt);
    ScreenToClient(pWndClipTo,&pt);
    rect->right = pt.x; rect->bottom = pt.y;
}

static void NormalizeRect(LPRECT rp)
{
    if(rp->left > rp->right)
        std::swap(rp->left, rp->right);
    if(rp->top > rp->bottom)
        std::swap(rp->top, rp->bottom);
}

using namespace winwrap;

Tracker::Tracker()
{
}

Tracker::Tracker(LPCRECT lpSrcRect, UINT nStyle)
{
    Construct();
    CopyRect(&m_rect,lpSrcRect);
    m_nStyle = nStyle;
}

static HBRUSH afxHatchBrush = nullptr;
static HPEN afxBlackDottedPen = nullptr;
static int afxHandleSize = 0;

void Tracker::Construct()
{
    static bool bInitialized = false;
    if (!bInitialized)
    {
        if (afxHatchBrush == nullptr)
        {
            // create the hatch pattern + bitmap
            WORD hatchPattern[8];
            WORD wPattern = 0x1111;
            for (int i = 0; i < 4; i++)
            {
                hatchPattern[i] = wPattern;
                hatchPattern[i+4] = wPattern;
                wPattern <<= 1;
            }
            HBITMAP hatchBitmap = CreateBitmap(8, 8, 1, 1,&hatchPattern);

            // create black hatched brush
            afxHatchBrush = CreatePatternBrush(hatchBitmap);
            DeleteObject(hatchBitmap);
        }

        if (afxBlackDottedPen == nullptr)
        {
            // create black dotted pen
            afxBlackDottedPen = CreatePen(PS_DOT, 0, RGB(0, 0, 0));
        }

        // get default handle size from Windows profile setting
        static const WCHAR szWindows[] = L"windows";
        static const WCHAR szInplaceBorderWidth[] = L"oleinplaceborderwidth";
        afxHandleSize = GetProfileIntW(szWindows, szInplaceBorderWidth, 4);
        bInitialized = true;

        afxCursors[0] = afxCursors[2] = LoadCursor(nullptr,IDC_SIZENWSE);
        afxCursors[4] = afxCursors[6] = LoadCursor(nullptr,IDC_SIZENS);
        afxCursors[1] = afxCursors[3] = LoadCursor(nullptr,IDC_SIZENESW);
        afxCursors[5] = afxCursors[7] = LoadCursor(nullptr,IDC_SIZEWE);
        afxCursors[8] = LoadCursor(nullptr,IDC_SIZEALL);
    }

    m_nStyle = 0;
    m_nHandleSize = afxHandleSize;
    m_sizeMin.cy = m_sizeMin.cx = m_nHandleSize*2;

    SetRectEmpty(&m_rectLast);
    m_sizeLast.cx = m_sizeLast.cy = 0;
    m_bErase = FALSE;
    m_bFinalErase =  FALSE;
}

Tracker::~Tracker()
{
}

int Tracker::HitTest(POINT point) const
{
    TrackerHit hitResult = hitNothing;

    RECT rectTrue;
    GetTrueRect(&rectTrue);
    NormalizeRect(&rectTrue);
    if (PtInRect(&rectTrue,point))
    {
        if ((m_nStyle & (resizeInside|resizeOutside)) != 0)
            hitResult = static_cast<TrackerHit>(HitTestHandles(point));
        else
            hitResult = hitMiddle;
    }
    return hitResult;
}

BOOL Tracker::SetCursor(HWND pWnd, UINT nHitTest) const
{
    // trackers should only be in client area
    if (nHitTest != HTCLIENT)
        return FALSE;

    // convert cursor position to client co-ordinates
    POINT point;
    GetCursorPos(&point);
    ScreenToClient(pWnd,&point);

    // do hittest and normalize hit
    int nHandle = HitTestHandles(point);
    if (nHandle < 0)
        return FALSE;

    // need to normalize the hittest such that we get proper cursors
    nHandle = NormalizeHit(nHandle);

    // handle special case of hitting area between handles
    //  (logically the same -- handled as a move -- but different cursor)
    if (nHandle == hitMiddle && !PtInRect(&m_rect,point))
    {
        // only for trackers with hatchedBorder (ie. in-place resizing)
        if (m_nStyle & hatchedBorder)
            nHandle = TrackerHit(9);
    }

    ::SetCursor(afxCursors[nHandle]);
    return TRUE;
}

BOOL Tracker::Track(HWND hWnd,POINT point,BOOL bAllowInvert,
                    HWND hWndClipTo)
{
    // perform hit testing on the handles
    int nHandle = HitTestHandles(point);
    if (nHandle < 0)
    {
        // didn't hit a handle, so just return FALSE
        return FALSE;
    }

    // otherwise, call helper function to do the tracking
    m_bAllowInvert = bAllowInvert;
    SetCursor(hWnd,nHandle);
    return TrackHandle(nHandle, hWnd, point, hWndClipTo);
}

BOOL Tracker::TrackHandle(int nHandle,HWND hWnd,POINT point,HWND hWndClipTo)
{
    // don't handle if capture already set
    if (GetCapture() != nullptr)
        return FALSE;

    // save original width & height in pixels
    int nWidth = m_rect.right - m_rect.left;
    int nHeight = m_rect.bottom - m_rect.top;

    // set capture to the window which received this message
    SetCapture(hWnd);
    UpdateWindow(hWnd);
    if (hWndClipTo != nullptr)
        UpdateWindow(hWndClipTo);
    RECT rectSave = m_rect;

    // find out what x/y coords we are supposed to modify
    int *px, *py;
    int xDiff, yDiff;
    GetModifyPointers(nHandle, &px, &py, &xDiff, &yDiff);
    xDiff = point.x - xDiff;
    yDiff = point.y - yDiff;

    // get DC for drawing
    HDC hDrawDC;
    if (hWndClipTo != nullptr)
    {
        // clip to arbitrary window by using adjusted Window DC
        hDrawDC = GetDCEx(hWndClipTo,nullptr, DCX_CACHE);
    }
    else
    {
        // otherwise, just use normal DC
        hDrawDC = GetDC(hWnd);
    }

    RECT rectOld;
    bool bMoved = false;

    // get messages until capture lost or cancelled/accepted
    for (;;)
    {
        MSG msg;
        int const bRet = GetMessageW(&msg, nullptr, 0, 0);
        SAL_WARN_IF(-1 == bRet, "embedserv", "GetMessageW failed: " << comphelper::WindowsErrorString(GetLastError()));
        if (-1 == bRet || 0 == bRet)
            break;

        if (GetCapture() != hWnd)
            break;

        switch (msg.message)
        {
            // handle movement/accept messages
        case WM_LBUTTONUP:
        case WM_MOUSEMOVE:
            rectOld = m_rect;
            // handle resize cases (and part of move)
            if (px != nullptr)
                *px = static_cast<int>(static_cast<short>(LOWORD(msg.lParam))) - xDiff;
            if (py != nullptr)
                *py = static_cast<int>(static_cast<short>(HIWORD(msg.lParam))) - yDiff;

            // handle move case
            if (nHandle == hitMiddle)
            {
                m_rect.right = m_rect.left + nWidth;
                m_rect.bottom = m_rect.top + nHeight;
            }
            // allow caller to adjust the rectangle if necessary
            AdjustRect(nHandle,&m_rect);

            // only redraw and callback if the rect actually changed!
            m_bFinalErase = (msg.message == WM_LBUTTONUP);
            if (!EqualRect(&rectOld,&m_rect) || m_bFinalErase)
            {
                if (bMoved)
                {
                    m_bErase = TRUE;
                    DrawTrackerRect(&rectOld,hWndClipTo,hDrawDC,hWnd);
                }
                OnChangedRect(rectOld);
                if (msg.message != WM_LBUTTONUP)
                    bMoved = true;
            }
            if (m_bFinalErase)
                goto ExitLoop;

            if (!EqualRect(&rectOld,&m_rect))
            {
                m_bErase = FALSE;
                DrawTrackerRect(&m_rect,hWndClipTo,hDrawDC,hWnd);
            }
            break;

            // handle cancel messages
        case WM_KEYDOWN:
            if (msg.wParam != VK_ESCAPE)
                break;
            [[fallthrough]];
        case WM_RBUTTONDOWN:
            if (bMoved)
            {
                m_bErase = m_bFinalErase = TRUE;
                DrawTrackerRect(&m_rect, hWndClipTo, hDrawDC, hWnd);
            }
            m_rect = rectSave;
            goto ExitLoop;

            // just dispatch rest of the messages
        default:
            DispatchMessageW(&msg);
            break;
        }
    }

  ExitLoop:
    if (hWndClipTo != nullptr)
        ReleaseDC(hWndClipTo,hDrawDC);
    else
        ReleaseDC(hWnd,hDrawDC);
    ReleaseCapture();

    // restore rect in case bMoved is still FALSE
    if (!bMoved)
        m_rect = rectSave;
    m_bFinalErase = FALSE;
    m_bErase = FALSE;

    // return TRUE only if rect has changed
    return !EqualRect(&rectSave,&m_rect);
}

void Tracker::OnChangedRect(const RECT& /*rectOld*/)
{
}

void Tracker::AdjustRect(int nHandle, LPRECT)
{
    if(nHandle == hitMiddle)
        return;

    // convert the handle into locations within m_rect
    int *px, *py;
    GetModifyPointers(nHandle, &px, &py, nullptr, nullptr);

    // enforce minimum width
    int nNewWidth = m_rect.right - m_rect.left;
    int nAbsWidth = m_bAllowInvert ? abs(nNewWidth) : nNewWidth;
    if (px != nullptr && nAbsWidth < m_sizeMin.cx)
    {
        nNewWidth = nAbsWidth != 0 ? nNewWidth / nAbsWidth : 1;
        const AFX_RECTINFO* pRectInfo =
            &afxRectInfo[px - reinterpret_cast<int*>(&m_rect)];
        *px = *reinterpret_cast<int*>(reinterpret_cast<BYTE*>(&m_rect) + pRectInfo->nOffsetAcross) +
            nNewWidth * m_sizeMin.cx * -pRectInfo->nSignAcross;
    }

    // enforce minimum height
    int nNewHeight = m_rect.bottom - m_rect.top;
    int nAbsHeight = m_bAllowInvert ? abs(nNewHeight) : nNewHeight;
    if (py != nullptr && nAbsHeight < m_sizeMin.cy)
    {
        nNewHeight = nAbsHeight != 0 ? nNewHeight / nAbsHeight : 1;
        const AFX_RECTINFO* pRectInfo =
            &afxRectInfo[py - reinterpret_cast<int*>(&m_rect)];
        *py = *reinterpret_cast<int*>(reinterpret_cast<BYTE*>(&m_rect) + pRectInfo->nOffsetAcross) +
            nNewHeight * m_sizeMin.cy * -pRectInfo->nSignAcross;
    }
}

void Tracker::DrawTrackerRect(
    LPRECT lpRect,HWND pWndClipTo,HDC pDC,HWND pWnd)
{
    // first, normalize the rectangle for drawing
    RECT rect = *lpRect;
    NormalizeRect(&rect);

    // convert to client coordinates
    if (pWndClipTo != nullptr)
        TransformRect(&rect,pWnd,pWndClipTo);

    SIZE size;
    size.cx = 0; size.cy = 0;
    if (!m_bFinalErase)
    {
        // otherwise, size depends on the style
        if (m_nStyle & hatchedBorder)
        {
            size.cx = size.cy = std::max(1,GetHandleSize(&rect)-1);
            InflateRect(&rect,size.cx,size.cy);
        }
        else
        {
            size.cx = 1; // CX_BORDER;
            size.cy = 1; // CY_BORDER;
        }
    }

    // and draw it
    if (m_bFinalErase || !m_bErase)
        DrawDragRect(pDC,&rect,size,&m_rectLast,m_sizeLast);

    // remember last rectangles
    m_rectLast = rect;
    m_sizeLast = size;
}

void Tracker::Draw(HDC hDC) const
{
    // set initial DC state
    SetMapMode(hDC,MM_TEXT);
    SetViewportOrgEx(hDC,0, 0,nullptr);
    SetWindowOrgEx(hDC,0, 0,nullptr);

    // get normalized rectangle
    RECT rect = m_rect;
    NormalizeRect(&rect);

    HPEN pOldPen = nullptr;
    HBRUSH pOldBrush = nullptr;
    HGDIOBJ pTemp;
    int nOldROP;

    // draw lines
    if ((m_nStyle & (dottedLine|solidLine)) != 0)
    {
        if (m_nStyle & dottedLine)
            pOldPen = static_cast<HPEN>(SelectObject(hDC,afxBlackDottedPen));
        else
            pOldPen = static_cast<HPEN>(SelectObject(hDC,reinterpret_cast<HGDIOBJ>(BLACK_PEN)));
        pOldBrush = static_cast<HBRUSH>(SelectObject(hDC,reinterpret_cast<HGDIOBJ>(NULL_BRUSH)));
        nOldROP = SetROP2(hDC,R2_COPYPEN);
        InflateRect(&rect,+1, +1);   // borders are one pixel outside
        Rectangle(hDC,rect.left, rect.top, rect.right, rect.bottom);
        SetROP2(hDC,nOldROP);
    }

    // if hatchBrush is going to be used, need to unrealize it
    if ((m_nStyle & (hatchInside|hatchedBorder)) != 0)
        UnrealizeObject(static_cast<HGDIOBJ>(afxHatchBrush));

    // hatch inside
    if ((m_nStyle & hatchInside) != 0)
    {
        pTemp = SelectObject(hDC,reinterpret_cast<HGDIOBJ>(NULL_PEN));
        if (pOldPen == nullptr)
            pOldPen = static_cast<HPEN>(pTemp);
        pTemp = SelectObject(hDC,static_cast<HGDIOBJ>(afxHatchBrush));
        if (pOldBrush == nullptr)
            pOldBrush = static_cast<HBRUSH>(pTemp);
        SetBkMode(hDC,TRANSPARENT);
        nOldROP = SetROP2(hDC,R2_MASKNOTPEN);
        Rectangle(hDC,rect.left+1, rect.top+1, rect.right, rect.bottom);
        SetROP2(hDC,nOldROP);
    }

    // draw hatched border
    if ((m_nStyle & hatchedBorder) != 0)
    {
        pTemp = SelectObject(hDC,static_cast<HGDIOBJ>(afxHatchBrush));
        if (pOldBrush == nullptr)
            pOldBrush = static_cast<HBRUSH>(pTemp);
        SetBkMode(hDC,OPAQUE);
        RECT rectTrue;
        GetTrueRect(&rectTrue);
        PatBlt(hDC,rectTrue.left, rectTrue.top, rectTrue.right-rectTrue.left,
               rect.top-rectTrue.top, 0x000F0001 /* Pn */);
        PatBlt(hDC,rectTrue.left, rect.bottom,
               rectTrue.right-rectTrue.left,
               rectTrue.bottom-rect.bottom, 0x000F0001 /* Pn */);
        PatBlt(hDC,rectTrue.left, rect.top, rect.left-rectTrue.left,
               rect.bottom-rect.top, 0x000F0001 /* Pn */);
        PatBlt(hDC,rect.right, rect.top, rectTrue.right-rect.right,
               rect.bottom-rect.top, 0x000F0001 /* Pn */);
    }

    // draw resize handles
    if ((m_nStyle & (resizeInside|resizeOutside)) != 0)
    {
        UINT mask = GetHandleMask();
        HBRUSH hbrush = CreateSolidBrush(RGB(0,0,0));
        for (int i = 0; i < 8; ++i)
        {
            if (mask & (1<<i))
            {
                GetHandleRect(static_cast<TrackerHit>(i), &rect);
                // FillSolidRect(hDC,rect, RGB(0, 0, 0));
                FillRect(hDC,&rect,hbrush);
            }
        }
        DeleteObject(hbrush);
    }

    // cleanup pDC state
    if (pOldPen != nullptr)
        SelectObject(hDC,pOldPen);
    if (pOldBrush != nullptr)
        SelectObject(hDC,pOldBrush);
    RestoreDC(hDC,-1);
}

void Tracker::GetHandleRect(int nHandle,RECT* pHandleRect) const
{
    // get normalized rectangle of the tracker
    RECT rectT = m_rect;
    NormalizeRect(&rectT);
    if ((m_nStyle & (solidLine|dottedLine)) != 0)
        InflateRect(&rectT,+1, +1);

    // since the rectangle itself was normalized, we also have to invert the
    //  resize handles.
    nHandle = NormalizeHit(nHandle);

    // handle case of resize handles outside the tracker
    int size = GetHandleSize();
    if (m_nStyle & resizeOutside)
        InflateRect(&rectT,size-1, size-1);

    // calculate position of the resize handle
    int nWidth = rectT.right - rectT.left;
    int nHeight = rectT.bottom - rectT.top;
    RECT rect;
    const AFX_HANDLEINFO* pHandleInfo = &afxHandleInfo[nHandle];
    rect.left = *reinterpret_cast<int*>(reinterpret_cast<BYTE*>(&rectT) + pHandleInfo->nOffsetX);
    rect.top = *reinterpret_cast<int*>(reinterpret_cast<BYTE*>(&rectT) + pHandleInfo->nOffsetY);
    rect.left += size * pHandleInfo->nHandleX;
    rect.top += size * pHandleInfo->nHandleY;
    rect.left += pHandleInfo->nCenterX * (nWidth - size) / 2;
    rect.top += pHandleInfo->nCenterY * (nHeight - size) / 2;
    rect.right = rect.left + size;
    rect.bottom = rect.top + size;

    *pHandleRect = rect;
}

int Tracker::GetHandleSize(LPRECT lpRect) const
{
    LPCRECT rect = lpRect == nullptr ? &m_rect : lpRect;

    int size = m_nHandleSize;
    if (!(m_nStyle & resizeOutside))
    {
        // make sure size is small enough for the size of the rect
        int sizeMax = std::min(abs(rect->right - rect->left),
                          abs(rect->bottom - rect->top));
        if (size * 2 > sizeMax)
            size = sizeMax / 2;
    }
    return size;
}

UINT Tracker::GetHandleMask() const
{
    UINT mask = 0x0F;   // always have 4 corner handles
    int size = m_nHandleSize*3;
    if (abs(m_rect.right - m_rect.left) - size > 4)
        mask |= 0x50;
    if (abs(m_rect.bottom - m_rect.top) - size > 4)
        mask |= 0xA0;
    return mask;
}

void Tracker::GetTrueRect(LPRECT lpTrueRect) const
{
    RECT rect = m_rect;
    NormalizeRect(&rect);
    int nInflateBy = 0;
    if ((m_nStyle & (resizeOutside|hatchedBorder)) != 0)
        nInflateBy += GetHandleSize() - 1;
    if ((m_nStyle & (solidLine|dottedLine)) != 0)
        ++nInflateBy;
    InflateRect(&rect,nInflateBy, nInflateBy);
    *lpTrueRect = rect;
}

int Tracker::NormalizeHit(int nHandle) const
{
    if (nHandle == hitMiddle || nHandle == hitNothing)
        return nHandle;
    const AFX_HANDLEINFO* pHandleInfo = &afxHandleInfo[nHandle];
    if (m_rect.right - m_rect.left < 0)
    {
        nHandle = static_cast<TrackerHit>(pHandleInfo->nInvertX);
        pHandleInfo = &afxHandleInfo[nHandle];
    }
    if (m_rect.bottom - m_rect.top < 0)
        nHandle = static_cast<TrackerHit>(pHandleInfo->nInvertY);
    return nHandle;
}

int Tracker::HitTestHandles(POINT point) const
{
    RECT rect;
    UINT mask = GetHandleMask();

    // see if hit anywhere inside the tracker
    GetTrueRect(&rect);
    if (!PtInRect(&rect,point))
        return hitNothing;  // totally missed

    // see if we hit a handle
    for (int i = 0; i < 8; ++i)
    {
        if (mask & (1<<i))
        {
            GetHandleRect(static_cast<TrackerHit>(i), &rect);
            if (PtInRect(&rect,point))
                return static_cast<TrackerHit>(i);
        }
    }

    // last of all, check for non-hit outside of object, between resize handles
    if ((m_nStyle & hatchedBorder) == 0)
    {
        rect = m_rect;
        NormalizeRect(&rect);
        if ((m_nStyle & (dottedLine|solidLine)) != 0)
            InflateRect(&rect,+1, +1);
        if (!PtInRect(&rect,point))
            return hitNothing;  // must have been between resize handles
    }
    return hitMiddle;   // no handle hit, but hit object (or object border)
}

void Tracker::GetModifyPointers(
    int nHandle, int** ppx, int** ppy, int* px, int* py)
{
    if (nHandle == hitMiddle)
        nHandle = hitTopLeft;   // same as hitting top-left

    *ppx = nullptr;
    *ppy = nullptr;

    // fill in the part of the rect that this handle modifies
    //  (Note: handles that map to themselves along a given axis when that
    //   axis is inverted don't modify the value on that axis)

    const AFX_HANDLEINFO* pHandleInfo = &afxHandleInfo[nHandle];
    if (pHandleInfo->nInvertX != nHandle)
    {
        *ppx = reinterpret_cast<int*>(reinterpret_cast<BYTE*>(&m_rect) + pHandleInfo->nOffsetX);
        if (px != nullptr)
            *px = **ppx;
    }
    else
    {
        // middle handle on X axis
        if (px != nullptr)
            *px = m_rect.left + (m_rect.left-m_rect.right) / 2;
    }
    if (pHandleInfo->nInvertY != nHandle)
    {
        *ppy = reinterpret_cast<int*>(reinterpret_cast<BYTE*>(&m_rect) + pHandleInfo->nOffsetY);
        if (py != nullptr)
            *py = **ppy;
    }
    else
    {
        // middle handle on Y axis
        if (py != nullptr)
            *py = m_rect.top + (m_rect.top-m_rect.bottom) / 2;
    }
}

/* vim:set shiftwidth=4 softtabstop=4 expandtab: */

quality100%

¤ Dauer der Verarbeitung: 0.21 Sekunden ¤

Wurzel

Suchen

Beweissystem der NASA

Beweissystem Isabelle

NIST Cobol Testsuite

Cephes Mathematical Library

Wiener Entwicklungsmethode

Haftungshinweis

Die Informationen auf dieser Webseite wurden nach bestem Wissen sorgfältig zusammengestellt. Es wird jedoch weder Vollständigkeit, noch Richtigkeit, noch Qualität der bereit gestellten Informationen zugesichert.

Bemerkung:

Die farbliche Syntaxdarstellung ist noch experimentell.