javauis/eswt_akn/org.eclipse.ercp.swt.s60/native/src/swtcontrolhelper.cpp
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Thu, 19 Aug 2010 09:48:13 +0300
branchRCL_3
changeset 60 6c158198356e
parent 19 04becd199f91
permissions -rw-r--r--
Revision: v2.2.9 Kit: 201033
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/*******************************************************************************
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 * Copyright (c) 2005, 2010 Nokia Corporation and/or its subsidiary(-ies).
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 * All rights reserved. This program and the accompanying materials
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 * are made available under the terms of the Eclipse Public License v1.0
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 * which accompanies this distribution, and is available at
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 * http://www.eclipse.org/legal/epl-v10.html
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 *
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 * Contributors:
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 *     Nokia Corporation - S60 implementation
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 *******************************************************************************/
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#include <baclipb.h>
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#include <s32ucmp.h>
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#include "swtcontrolhelper.h"
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#ifdef SYMBIAN_ENABLE_SPLIT_HEADERS
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#include <txtclipboard.h>
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#endif
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// ======== MEMBER FUNCTIONS ========
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/**
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 * Creates a copy of the bitmap passed as a parameter and returns a pointer to the copy.
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 * The caller is responsible for destroying the returned pointer, which is on the cleanup stack.
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 */
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CFbsBitmap* SwtControlHelper::GetCopyOfBitmapLC(const CFbsBitmap* aBitmap,
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        const TSize& aTargetSize)
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{
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    if (!aBitmap)
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    {
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        return NULL;
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    }
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    TSize bmpSize(aBitmap->SizeInPixels());
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    TBool doScaledCopy(ETrue);
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    if ((aTargetSize == TSize(-1, -1)) || (aTargetSize == bmpSize))
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    {
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        doScaledCopy = EFalse;
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    }
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    CFbsBitmap* result = new(ELeave) CFbsBitmap;
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    CleanupStack::PushL(result);
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    TSize size;
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    if (doScaledCopy)
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    {
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        size = aTargetSize;
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    }
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    else
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    {
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        size = bmpSize;
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    }
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    User::LeaveIfError(result->Create(size, aBitmap->DisplayMode()));
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    if (doScaledCopy)
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    {
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        // Create a gc for drawing to the bitmap
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        CFbsBitGc* fbsBitGc = CFbsBitGc::NewL();
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        CleanupStack::PushL(fbsBitGc);
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        CFbsBitmapDevice* bmpDevice = CFbsBitmapDevice::NewL(result);
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        CleanupStack::Pop(fbsBitGc);
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        fbsBitGc->Activate(bmpDevice);
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        // Draw the scaled copy
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        fbsBitGc->DrawBitmap(TRect(TPoint(0, 0), size), aBitmap);
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        delete bmpDevice;
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        delete fbsBitGc;
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    }
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    else // Do a same-sized copy
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    {
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        TInt len = size.iHeight * CFbsBitmap::ScanLineLength(size.iWidth, aBitmap->DisplayMode());
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        ASSERT(len > 0);
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        result->LockHeap();
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        Mem::Copy(reinterpret_cast<TUint8*>(result->DataAddress()),
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                  reinterpret_cast<const TUint8*>(aBitmap->DataAddress()), len);
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        result->UnlockHeap();
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    }
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    return result;
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}
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/**
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 * Creates a copy of the bitmap passed as a parameter and returns a pointer to the copy.
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 * The caller is responsible for destroying the returned pointer.
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 */
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CFbsBitmap* SwtControlHelper::GetCopyOfBitmapL(const CFbsBitmap* aBitmap,
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        const TSize& aTargetSize)
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{
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    CFbsBitmap* result = GetCopyOfBitmapLC(aBitmap, aTargetSize);
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    if (result)
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    {
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        CleanupStack::Pop(result);
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    }
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    return result;
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}
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/**
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 * Creates a copy of the bitmap passed as a parameter and returns a pointer to the copy.
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 * The caller is responsible for destroying the returned pointer, which is on the cleanup stack.
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 * If the parameter bitmap is a monochrome bitmap then the copy will be inverted.
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 * This function is intended to be used in cases where the component doing the drawing
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   110
 * is expecting an inverted mask bitmap.
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   111
 */
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diff changeset
   112
CFbsBitmap* SwtControlHelper::GetInvertedCopyOfMonoBitmapLC(const CFbsBitmap* aBitmap,
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   113
        const TSize& aTargetSize)
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   114
{
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   115
    if (!aBitmap)
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   116
    {
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   117
        return NULL;
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   118
    }
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   119
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   120
    if (!aBitmap->IsMonochrome())
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   121
    {
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   122
        return GetCopyOfBitmapLC(aBitmap, aTargetSize);
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   123
    }
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   124
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   125
    TBool doScaledCopy(aTargetSize == TSize(-1, -1) ? EFalse : ETrue);
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   126
    TSize size;
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   127
    if (doScaledCopy)
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   128
    {
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   129
        size = aTargetSize;
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   130
    }
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   131
    else
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   132
    {
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   133
        size = aBitmap->SizeInPixels();
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   134
    }
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   135
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   136
    CFbsBitmap* target = new(ELeave) CFbsBitmap;
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   137
    CleanupStack::PushL(target);
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   138
    User::LeaveIfError(target->Create(size, EGray2));
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   139
    CFbsBitmapDevice* device = CFbsBitmapDevice::NewL(target);
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   140
    CleanupStack::PushL(device);
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   141
    CFbsBitGc* gc = NULL;
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   142
    User::LeaveIfError(device->CreateContext(gc));
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   143
    TInt drawMode = CGraphicsContext::EDrawModeWriteAlpha | CGraphicsContext::EInvertPen;
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   144
    gc->SetDrawMode(CGraphicsContext::TDrawMode(drawMode));
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   145
    if (doScaledCopy)
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   146
    {
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   147
        gc->DrawBitmap(TRect(TPoint(0, 0), size), aBitmap);
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   148
    }
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   149
    else
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   150
    {
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   151
        gc->BitBlt(TPoint(), aBitmap);
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   152
    }
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   153
    delete gc;
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   154
    CleanupStack::PopAndDestroy(device);
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   155
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    return target;
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   157
}
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   158
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   159
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   160
/**
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   161
 * Creates a copy of the bitmap passed as a parameter and returns a pointer to the copy.
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   162
 * The caller is responsible for destroying the returned pointer, which is on the cleanup stack.
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   163
 * If the parameter bitmap is a monochrome bitmap then the copy will be inverted.
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   164
 * This function is intended to be used in cases where the component doing the drawing
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   165
 * is expecting an inverted mask bitmap.
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   166
 */
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   167
CFbsBitmap* SwtControlHelper::GetInvertedCopyOfMonoBitmapL(const CFbsBitmap* aBitmap,
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   168
        const TSize& aTargetSize)
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   169
{
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   170
    CFbsBitmap* result = GetInvertedCopyOfMonoBitmapLC(aBitmap, aTargetSize);
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   171
    if (result)
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   172
    {
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   173
        CleanupStack::Pop(result);
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   174
    }
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   175
    return result;
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   176
}
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   177
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   178
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   179
/**
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   180
 * Retrieves the clipboard's text content
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   181
 *
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   182
 * It is up to the caller to free the descriptor by calling
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   183
 * <code>CleanupStack::PopAndDestroy()</code> if the descriptor's
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   184
 * pointer is not <code>NULL</code>
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   185
 *
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   186
 * @return A descriptor containing the clipboard's content.
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   187
 */
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   188
TPtr SwtControlHelper::GetClipboardTextContentLC()
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   189
{
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   190
    // Get the clipboard
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   191
    CClipboard* cb = NULL;
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   192
    TRAPD(error, (cb = CClipboard::NewForReadingL(CEikonEnv::Static()->FsSession()))); // codescanner::eikonenvstatic
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   193
    if (error == KErrPathNotFound || error==KErrNotFound)  // Nothing in the clipboard, not an error
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   194
        return TPtr(NULL, 0, 0);
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   195
    User::LeaveIfError(error);
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   196
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   197
    CleanupStack::PushL(cb);
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   198
    TStreamId id(cb->StreamDictionary().At(KClipboardUidTypePlainText));     //lint !e613
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   199
    if (id == KNullStreamId)
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   200
    {
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   201
        CleanupStack::PopAndDestroy(cb);
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   202
        return TPtr(NULL, 0, 0);
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   203
    }
04becd199f91 Revision: v2.1.22
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diff changeset
   204
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   205
    RStoreReadStream stream;
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   206
    stream.OpenLC(cb->Store(), id);   //lint !e613
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   207
    TInt length = stream.ReadInt32L();
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   208
    CBufFlat* buffer = CBufFlat::NewL(length);
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diff changeset
   209
    CleanupStack::PushL(buffer);
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diff changeset
   210
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   211
    RBufWriteStream bufStream(*buffer);
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   212
    CleanupClosePushL(bufStream);
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   213
    TMemoryStreamUnicodeSink sink(bufStream);
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   214
    TUnicodeExpander e;
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   215
    e.ExpandL(sink, stream, length);
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   216
    bufStream.CommitL();
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diff changeset
   217
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   218
    CleanupStack::PopAndDestroy();      // bufStream
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   219
    CleanupStack::Pop(buffer);
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    CleanupStack::PopAndDestroy(2, cb);   // stream, cb
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    CleanupStack::PushL(buffer);
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    TPtrC8 ptr8(buffer->Ptr(0));
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    return TPtr16(reinterpret_cast<TText16*>(const_cast<TText8*>(ptr8.Ptr())),
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                  length,
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                  length);  //lint !e826
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}
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/*
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 * Returns size for a bitmap that is scaled to fit inside aMaxDestSize
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 * if aSourceSize > aMaxDestSize. The scaling is done so that aspect ratio of the
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 * result is the same as in source.
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 *
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 * If aSourceSize < aMaxDestSize, no scaling is done.
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 */
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TSize SwtControlHelper::GetAspectRatioScaledBitmapSize(const TSize& aSourceSize,
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        const TSize& aMaxDestSize)
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{
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    TSize imageSize = aSourceSize;
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    TInt yDiff = 0, xDiff = 0;
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    TBool scalingNeeded = EFalse;
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    if (aSourceSize.iWidth == 0 || aSourceSize.iHeight == 0)
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    {
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        return imageSize;
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    }
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    // Figure out if any scaling is needed
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    if (aSourceSize.iHeight > aMaxDestSize.iHeight)
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    {
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        yDiff = aSourceSize.iHeight - aMaxDestSize.iHeight;
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        scalingNeeded = ETrue;
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    }
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    if (aSourceSize.iWidth > aMaxDestSize.iWidth)
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    {
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        xDiff = aSourceSize.iWidth - aMaxDestSize.iWidth;
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        scalingNeeded = ETrue;
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    }
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    if (scalingNeeded)
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    {
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        if (xDiff > yDiff)
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        {
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            imageSize.iWidth = aMaxDestSize.iWidth;
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            imageSize.iHeight = (aSourceSize.iHeight * aMaxDestSize.iWidth) / aSourceSize.iWidth;
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        }
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        else if (yDiff > xDiff)
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        {
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            imageSize.iHeight = aMaxDestSize.iHeight;
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            imageSize.iWidth = (aSourceSize.iWidth * aMaxDestSize.iHeight) / aSourceSize.iHeight;
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        }
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        else
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        {
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            // aspect ratios are the same
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            imageSize = aMaxDestSize;
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        }
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    }
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    return imageSize;
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}