forked from openkylin/kolourpaint
129 lines
4.2 KiB
C++
129 lines
4.2 KiB
C++
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/*
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Copyright (c) 2003-2007 Clarence Dang <dang@kde.org>
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Copyright (c) 2010 Tasuku Suzuki <stasuku@gmail.com>
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions
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are met:
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1. Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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2. Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#define DEBUG_KP_SELECTION 0
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#include "kpTextSelection.h"
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#include "kpTextSelectionPrivate.h"
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#include "kpDefs.h"
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#include "kpTextStyle.h"
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#include "kpPreeditText.h"
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#include "kpLogCategories.h"
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#include <QFontMetrics>
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// public
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int kpTextSelection::closestTextRowForPoint (const QPoint &point) const
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{
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if (!pointIsInTextArea (point)) {
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return -1;
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}
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const QFontMetrics fontMetrics (d->textStyle.fontMetrics ());
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int row = (point.y () - textAreaRect ().y ()) /
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fontMetrics.lineSpacing ();
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if (row >= static_cast<int> (d->textLines.size ())) {
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row = d->textLines.size () - 1;
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}
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return row;
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}
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// public
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int kpTextSelection::closestTextColForPoint (const QPoint &point) const
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{
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int row = closestTextRowForPoint (point);
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if (row < 0 || row >= static_cast<int> (d->textLines.size ())) {
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return -1;
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}
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const int localX = point.x () - textAreaRect ().x ();
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const QFontMetrics fontMetrics (d->textStyle.fontMetrics ());
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// (should be 0 but call just in case)
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int charLocalLeft = fontMetrics.horizontalAdvance(d->textLines [row], 0);
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// OPT: binary search or guess location then move
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for (int col = 0; col < static_cast<int> (d->textLines [row].length ()); col++)
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{
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// OPT: fontMetrics::charWidth() might be faster
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const int nextCharLocalLeft = fontMetrics.horizontalAdvance(d->textLines [row], col + 1);
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if (localX <= (charLocalLeft + nextCharLocalLeft) / 2) {
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return col;
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}
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charLocalLeft = nextCharLocalLeft;
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}
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return d->textLines [row].length ()/*past end of line*/;
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}
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//---------------------------------------------------------------------
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// public
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QPoint kpTextSelection::pointForTextRowCol (int row, int col) const
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{
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kpPreeditText preeditText = d->preeditText;
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if ((row < 0 || col < 0) ||
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(preeditText.isEmpty () &&
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(row >= static_cast<int> (d->textLines.size ()) || col > static_cast<int> (d->textLines [row].length ()))))
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{
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#if DEBUG_KP_SELECTION && 1
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qCDebug(kpLogLayers) << "kpTextSelection::pointForTextRowCol("
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<< row << ","
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<< col << ") out of range"
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<< " textLines='"
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<< text ()
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<< "'";
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#endif
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return KP_INVALID_POINT;
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}
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const QFontMetrics fontMetrics (d->textStyle.fontMetrics ());
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QString line = (d->textLines.count () > row) ? d->textLines[row] : QString ();
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if (row == preeditText.position ().y ())
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{
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line.insert (preeditText.position ().x (), preeditText.preeditString ());
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}
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const int x = fontMetrics.horizontalAdvance(line.left(col));
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const int y = row * fontMetrics.height () +
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(row >= 1 ? row * fontMetrics.leading () : 0);
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return textAreaRect ().topLeft () + QPoint (x, y);
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}
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//---------------------------------------------------------------------
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