diff options
Diffstat (limited to 'kolourpaint/widgets/kpsqueezedtextlabel.cpp')
| -rw-r--r-- | kolourpaint/widgets/kpsqueezedtextlabel.cpp | 215 |
1 files changed, 215 insertions, 0 deletions
diff --git a/kolourpaint/widgets/kpsqueezedtextlabel.cpp b/kolourpaint/widgets/kpsqueezedtextlabel.cpp new file mode 100644 index 00000000..53fd85c9 --- /dev/null +++ b/kolourpaint/widgets/kpsqueezedtextlabel.cpp @@ -0,0 +1,215 @@ + +/* + Copyright (c) 2003,2004,2005 Clarence Dang <dang@kde.org> + All rights reserved. + + Redistribution and use in source and binary forms, with or without + modification, are permitted provided that the following conditions + are met: + + 1. Redistributions of source code must retain the above copyright + notice, this list of conditions and the following disclaimer. + 2. Redistributions in binary form must reproduce the above copyright + notice, this list of conditions and the following disclaimer in the + documentation and/or other materials provided with the distribution. + + THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR + IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES + OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. + IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, + INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT + NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF + THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. +*/ + +#define DEBUG_KP_SQUEEZED_TEXT_LABEL 0 + + +#include <kpsqueezedtextlabel.h> + +#include <qfont.h> +#include <qfontmetrics.h> +#include <qstring.h> + +#include <kdebug.h> +#include <klocale.h> + + +kpSqueezedTextLabel::kpSqueezedTextLabel (QWidget *parent, const char *name) + : QLabel (parent, name), + m_showEllipsis (true) +{ +} + +kpSqueezedTextLabel::kpSqueezedTextLabel (const QString &text, QWidget *parent, const char *name) + : QLabel (parent, name), + m_showEllipsis (true) +{ + setText (text); +} + + +// public virtual +QSize kpSqueezedTextLabel::minimumSizeHint () const +{ +#if DEBUG_KP_SQUEEZED_TEXT_LABEL && 1 + kdDebug () << "kpSqueezedTextLabel::minimumSizeHint() qLabel prefers" + << QLabel::minimumSizeHint () << endl; +#endif + return QSize (-1/*no minimum width*/, QLabel::minimumHeight ()); +} + + +// public +QString kpSqueezedTextLabel::fullText () const +{ + return m_fullText; +} + + +// public +bool kpSqueezedTextLabel::showEllipsis () const +{ + return m_showEllipsis; +} + +// public +void kpSqueezedTextLabel::setShowEllipsis (bool yes) +{ + if (m_showEllipsis == yes) + return; + + m_showEllipsis = yes; + + squeezeText (); +} + + +// public slots virtual [base QLabel] +void kpSqueezedTextLabel::setText (const QString &text) +{ + m_fullText = text; + squeezeText (); +} + + +// protected virtual [base QWidget] +void kpSqueezedTextLabel::resizeEvent (QResizeEvent *e) +{ +#if DEBUG_KP_SQUEEZED_TEXT_LABEL && 1 + kdDebug () << "kpSqueezedTextLabeL::resizeEvent() size=" << e->size () + << " oldSize=" << e->oldSize () + << endl; +#endif + squeezeText (); +} + + +// protected +QString kpSqueezedTextLabel::ellipsisText () const +{ + return m_showEllipsis ? i18n ("...") : QString::null; +} + +// protected +void kpSqueezedTextLabel::squeezeText () +{ +#if DEBUG_KP_SQUEEZED_TEXT_LABEL && 1 + kdDebug () << "kpSqueezedTextLabeL::squeezeText" << endl; +#endif + + QFontMetrics fontMetrics (font ()); + int fullTextWidth = fontMetrics.width (m_fullText); +#if DEBUG_KP_SQUEEZED_TEXT_LABEL && 1 + kdDebug () << "\tfullText=" << m_fullText + << " fullTextWidth=" << fullTextWidth + << " labelWidth=" << width () + << endl; +#endif + + if (fullTextWidth <= width ()) + { + #if DEBUG_KP_SQUEEZED_TEXT_LABEL && 1 + kdDebug () << "\tfullText will fit - display" << endl; + #endif + QLabel::setText (m_fullText); + } + else + { + #if DEBUG_KP_SQUEEZED_TEXT_LABEL && 1 + kdDebug () << "\tfullText won't fit :( - squeeze" << endl; + kdDebug () << "\t\twidth of \"...\"=" + << fontMetrics.width (ellipsisText ()) + << endl; + + #endif + if (fontMetrics.width (ellipsisText ()) > width ()) + { + #if DEBUG_KP_SQUEEZED_TEXT_LABEL && 1 + kdDebug () << "\t\t\tcan't even fit \"...\" - forget it" << endl; + #endif + QLabel::setText (QString::null); + return; + } + + // Binary search our way to fit squeezed text + int numLettersToUseLo = 0; + int numLettersToUseHi = m_fullText.length (); + int numLettersToUse = 0; + + while (numLettersToUseLo <= numLettersToUseHi) + { + int numLettersToUseMid = (numLettersToUseLo + numLettersToUseHi) / 2; + int squeezedWidth = fontMetrics.width (m_fullText.left (numLettersToUseMid) + ellipsisText ()); + #if DEBUG_KP_SQUEEZED_TEXT_LABEL && 1 + kdDebug () << "\tbsearch: lo=" << numLettersToUseLo + << " hi=" << numLettersToUseHi + << " mid=" << numLettersToUseMid + << " acceptable=" << numLettersToUse + << " squeezedWidth=" << squeezedWidth + << endl; + #endif + + if (squeezedWidth == width ()) + { + #if DEBUG_KP_SQUEEZED_TEXT_LABEL && 1 + kdDebug () << "\t\tperfect match!" << endl; + #endif + numLettersToUse = numLettersToUseMid; + break; + } + else if (squeezedWidth < width ()) + { + #if DEBUG_KP_SQUEEZED_TEXT_LABEL && 1 + kdDebug () << "\t\tsmall enough - numLettersToUse=" + << numLettersToUse << endl; + #endif + if (numLettersToUseMid > numLettersToUse) + { + numLettersToUse = numLettersToUseMid; + #if DEBUG_KP_SQUEEZED_TEXT_LABEL && 1 + kdDebug () << "\t\t\tset numLettersToUse=" + << numLettersToUse + << endl; + #endif + } + + numLettersToUseLo = numLettersToUseMid + 1; + } + else + { + #if DEBUG_KP_SQUEEZED_TEXT_LABEL && 1 + kdDebug () << "\t\ttoo big" << endl; + #endif + numLettersToUseHi = numLettersToUseMid - 1; + } + } + + QLabel::setText (m_fullText.left (numLettersToUse) + ellipsisText ()); + } +} + +#include <kpsqueezedtextlabel.moc> |