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477 lines
14 KiB
477 lines
14 KiB
/*
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* spinbox.cpp - spin box with read-only option and shift-click step value
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* Program: kalarm
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* Copyright © 2002,2004,2008 by David Jarvie <djarvie@kde.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#include <kdeversion.h>
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#include <tqlineedit.h>
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#include <tqobjectlist.h>
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#include "spinbox.moc"
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SpinBox::SpinBox(TQWidget* parent, const char* name)
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: TQSpinBox(0, 99999, 1, parent, name),
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mMinValue(TQSpinBox::minValue()),
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mMaxValue(TQSpinBox::maxValue())
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{
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init();
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}
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SpinBox::SpinBox(int minValue, int maxValue, int step, TQWidget* parent, const char* name)
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: TQSpinBox(minValue, maxValue, step, parent, name),
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mMinValue(minValue),
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mMaxValue(maxValue)
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{
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init();
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}
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void SpinBox::init()
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{
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int step = TQSpinBox::lineStep();
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mLineStep = step;
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mLineShiftStep = step;
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mCurrentButton = NO_BUTTON;
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mShiftMouse = false;
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mShiftMinBound = false;
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mShiftMaxBound = false;
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mSelectOnStep = true;
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mReadOnly = false;
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mSuppressSignals = false;
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mEdited = false;
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// Find the spin widgets which are part of the spin boxes, in order to
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// handle their shift-button presses.
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TQObjectList* spinwidgets = queryList("TQSpinWidget", 0, false, true);
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TQSpinWidget* spin = (TQSpinWidget*)spinwidgets->getFirst();
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if (spin)
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spin->installEventFilter(this); // handle shift-button presses
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delete spinwidgets;
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editor()->installEventFilter(this); // handle shift-up/down arrow presses
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#if KDE_IS_VERSION(3,1,90)
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// Detect when the text field is edited
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connect(editor(), TQT_SIGNAL(textChanged(const TQString&)), TQT_SLOT(textEdited()));
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#endif
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}
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void SpinBox::setReadOnly(bool ro)
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{
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if ((int)ro != (int)mReadOnly)
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{
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mReadOnly = ro;
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editor()->setReadOnly(ro);
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if (ro)
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setShiftStepping(false, mCurrentButton);
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}
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}
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int SpinBox::bound(int val) const
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{
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return (val < mMinValue) ? mMinValue : (val > mMaxValue) ? mMaxValue : val;
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}
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void SpinBox::setMinValue(int val)
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{
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mMinValue = val;
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TQSpinBox::setMinValue(val);
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mShiftMinBound = false;
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}
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void SpinBox::setMaxValue(int val)
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{
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mMaxValue = val;
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TQSpinBox::setMaxValue(val);
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mShiftMaxBound = false;
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}
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void SpinBox::setLineStep(int step)
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{
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mLineStep = step;
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if (!mShiftMouse)
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TQSpinBox::setLineStep(step);
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}
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void SpinBox::setLineShiftStep(int step)
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{
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mLineShiftStep = step;
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if (mShiftMouse)
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TQSpinBox::setLineStep(step);
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}
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void SpinBox::stepUp()
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{
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int step = TQSpinBox::lineStep();
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addValue(step);
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emit stepped(step);
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}
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void SpinBox::stepDown()
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{
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int step = -TQSpinBox::lineStep();
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addValue(step);
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emit stepped(step);
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}
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/******************************************************************************
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* Adds a positive or negative increment to the current value, wrapping as appropriate.
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* If 'current' is true, any temporary 'shift' values for the range are used instead
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* of the real maximum and minimum values.
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*/
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void SpinBox::addValue(int change, bool current)
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{
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int newval = value() + change;
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int maxval = current ? TQSpinBox::maxValue() : mMaxValue;
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int minval = current ? TQSpinBox::minValue() : mMinValue;
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if (wrapping())
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{
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int range = maxval - minval + 1;
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if (newval > maxval)
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newval = minval + (newval - maxval - 1) % range;
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else if (newval < minval)
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newval = maxval - (minval - 1 - newval) % range;
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}
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else
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{
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if (newval > maxval)
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newval = maxval;
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else if (newval < minval)
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newval = minval;
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}
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setValue(newval);
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}
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void SpinBox::valueChange()
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{
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if (!mSuppressSignals)
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{
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int val = value();
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if (mShiftMinBound && val >= mMinValue)
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{
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// Reinstate the minimum bound now that the value has returned to the normal range.
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TQSpinBox::setMinValue(mMinValue);
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mShiftMinBound = false;
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}
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if (mShiftMaxBound && val <= mMaxValue)
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{
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// Reinstate the maximum bound now that the value has returned to the normal range.
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TQSpinBox::setMaxValue(mMaxValue);
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mShiftMaxBound = false;
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}
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bool focus = !mSelectOnStep && hasFocus();
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if (focus)
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clearFocus(); // prevent selection of the spin box text
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TQSpinBox::valueChange();
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if (focus)
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setFocus();
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}
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}
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/******************************************************************************
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* Called whenever the line edit text is changed.
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*/
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void SpinBox::textEdited()
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{
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mEdited = true;
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}
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void SpinBox::updateDisplay()
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{
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mEdited = false;
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TQSpinBox::updateDisplay();
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}
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/******************************************************************************
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* Receives events destined for the spin widget or for the edit field.
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*/
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bool SpinBox::eventFilter(TQObject* obj, TQEvent* e)
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{
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if (obj == editor())
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{
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int step = 0;
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bool shift = false;
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switch (e->type())
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{
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case TQEvent::KeyPress:
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{
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// Up and down arrow keys step the value
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TQKeyEvent* ke = (TQKeyEvent*)e;
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int key = ke->key();
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if (key == Qt::Key_Up)
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step = 1;
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else if (key == Qt::Key_Down)
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step = -1;
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shift = ((ke->state() & (Qt::ShiftButton | Qt::AltButton)) == Qt::ShiftButton);
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break;
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}
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case TQEvent::Wheel:
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{
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TQWheelEvent* we = (TQWheelEvent*)e;
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step = (we->delta() > 0) ? 1 : -1;
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shift = ((we->state() & (Qt::ShiftButton | Qt::AltButton)) == Qt::ShiftButton);
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break;
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}
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#if KDE_IS_VERSION(3,1,90)
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case TQEvent::Leave:
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if (mEdited)
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interpretText();
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break;
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#endif
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default:
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break;
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}
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if (step)
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{
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if (mReadOnly)
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return true; // discard up/down arrow keys or wheel
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if (shift)
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{
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// Shift stepping
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int val = value();
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if (step > 0)
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step = mLineShiftStep - val % mLineShiftStep;
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else
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step = - ((val + mLineShiftStep - 1) % mLineShiftStep + 1);
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}
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else
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step = (step > 0) ? mLineStep : -mLineStep;
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addValue(step, false);
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return true;
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}
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}
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else
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{
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int etype = e->type(); // avoid switch compile warnings
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switch (etype)
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{
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case TQEvent::MouseButtonPress:
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case TQEvent::MouseButtonDblClick:
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{
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TQMouseEvent* me = (TQMouseEvent*)e;
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if (me->button() == Qt::LeftButton)
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{
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// It's a left button press. Set normal or shift stepping as appropriate.
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if (mReadOnly)
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return true; // discard the event
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mCurrentButton = whichButton(me->pos());
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if (mCurrentButton == NO_BUTTON)
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return true;
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bool shift = (me->state() & (Qt::ShiftButton | Qt::AltButton)) == Qt::ShiftButton;
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if (setShiftStepping(shift, mCurrentButton))
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return true; // hide the event from the spin widget
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return false; // forward event to the destination widget
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}
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break;
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}
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case TQEvent::MouseButtonRelease:
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{
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TQMouseEvent* me = (TQMouseEvent*)e;
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if (me->button() == Qt::LeftButton && mShiftMouse)
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{
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setShiftStepping(false, mCurrentButton); // cancel shift stepping
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return false; // forward event to the destination widget
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}
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break;
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}
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case TQEvent::MouseMove:
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{
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TQMouseEvent* me = (TQMouseEvent*)e;
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if (me->state() & Qt::LeftButton)
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{
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// The left button is down. Track which spin button it's in.
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if (mReadOnly)
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return true; // discard the event
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int newButton = whichButton(me->pos());
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if (newButton != mCurrentButton)
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{
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// The mouse has moved to a new spin button.
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// Set normal or shift stepping as appropriate.
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mCurrentButton = newButton;
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bool shift = (me->state() & (Qt::ShiftButton | Qt::AltButton)) == Qt::ShiftButton;
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if (setShiftStepping(shift, mCurrentButton))
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return true; // hide the event from the spin widget
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}
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return false; // forward event to the destination widget
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}
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break;
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}
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case TQEvent::Wheel:
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{
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TQWheelEvent* we = (TQWheelEvent*)e;
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bool shift = (we->state() & (Qt::ShiftButton | Qt::AltButton)) == Qt::ShiftButton;
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if (setShiftStepping(shift, (we->delta() > 0 ? UP : DOWN)))
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return true; // hide the event from the spin widget
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return false; // forward event to the destination widget
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}
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case TQEvent::KeyPress:
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case TQEvent::KeyRelease:
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case TQEvent::AccelOverride: // this is needed to receive Shift presses!
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{
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TQKeyEvent* ke = (TQKeyEvent*)e;
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int key = ke->key();
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int state = ke->state();
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if ((state & Qt::LeftButton)
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&& (key == Qt::Key_Shift || key == Qt::Key_Alt))
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{
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// The left mouse button is down, and the Shift or Alt key has changed
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if (mReadOnly)
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return true; // discard the event
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state ^= (key == Qt::Key_Shift) ? Qt::ShiftButton : Qt::AltButton; // new state
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bool shift = (state & (Qt::ShiftButton | Qt::AltButton)) == Qt::ShiftButton;
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if ((!shift && mShiftMouse) || (shift && !mShiftMouse))
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{
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// The effective shift state has changed.
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// Set normal or shift stepping as appropriate.
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if (setShiftStepping(shift, mCurrentButton))
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return true; // hide the event from the spin widget
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}
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}
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break;
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}
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}
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}
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return TQSpinBox::eventFilter(obj, e);
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}
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/******************************************************************************
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* Set spin widget stepping to the normal or shift increment.
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*/
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bool SpinBox::setShiftStepping(bool shift, int currentButton)
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{
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if (currentButton == NO_BUTTON)
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shift = false;
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if (shift && !mShiftMouse)
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{
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/* The value is to be stepped to a multiple of the shift increment.
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* Adjust the value so that after the spin widget steps it, it will be correct.
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* Then, if the mouse button is held down, the spin widget will continue to
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* step by the shift amount.
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*/
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int val = value();
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int step = (currentButton == UP) ? mLineShiftStep : (currentButton == DOWN) ? -mLineShiftStep : 0;
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int adjust = shiftStepAdjustment(val, step);
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mShiftMouse = true;
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if (adjust)
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{
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/* The value is to be stepped by other than the shift increment,
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* presumably because it is being set to a multiple of the shift
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* increment. Achieve this by making the adjustment here, and then
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* allowing the normal step processing to complete the job by
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* adding/subtracting the normal shift increment.
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*/
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if (!wrapping())
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{
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// Prevent the step from going past the spinbox's range, or
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// to the minimum value if that has a special text unless it is
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// already at the minimum value + 1.
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int newval = val + adjust + step;
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int svt = specialValueText().isEmpty() ? 0 : 1;
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int minval = mMinValue + svt;
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if (newval <= minval || newval >= mMaxValue)
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{
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// Stepping to the minimum or maximum value
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if (svt && newval <= mMinValue && val == mMinValue)
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newval = mMinValue;
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else
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newval = (newval <= minval) ? minval : mMaxValue;
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TQSpinBox::setValue(newval);
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emit stepped(step);
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return true;
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}
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// If the interim value will lie outside the spinbox's range,
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// temporarily adjust the range to allow the value to be set.
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int tempval = val + adjust;
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if (tempval < mMinValue)
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{
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TQSpinBox::setMinValue(tempval);
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mShiftMinBound = true;
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}
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else if (tempval > mMaxValue)
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{
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TQSpinBox::setMaxValue(tempval);
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mShiftMaxBound = true;
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}
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}
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// Don't process changes since this new value will be stepped immediately
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mSuppressSignals = true;
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bool blocked = signalsBlocked();
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blockSignals(true);
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addValue(adjust, true);
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blockSignals(blocked);
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mSuppressSignals = false;
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}
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TQSpinBox::setLineStep(mLineShiftStep);
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}
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else if (!shift && mShiftMouse)
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{
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// Reinstate to normal (non-shift) stepping
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TQSpinBox::setLineStep(mLineStep);
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TQSpinBox::setMinValue(mMinValue);
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TQSpinBox::setMaxValue(mMaxValue);
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mShiftMinBound = mShiftMaxBound = false;
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mShiftMouse = false;
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}
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return false;
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}
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/******************************************************************************
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* Return the initial adjustment to the value for a shift step up or down.
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* The default is to step up or down to the nearest multiple of the shift
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* increment, so the adjustment returned is for stepping up the decrement
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* required to round down to a multiple of the shift increment <= current value,
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* or for stepping down the increment required to round up to a multiple of the
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* shift increment >= current value.
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* This method's caller then adjusts the resultant value if necessary to cater
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* for the widget's minimum/maximum value, and wrapping.
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* This should really be a static method, but it needs to be virtual...
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*/
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int SpinBox::shiftStepAdjustment(int oldValue, int shiftStep)
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{
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if (oldValue == 0 || shiftStep == 0)
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return 0;
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if (shiftStep > 0)
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{
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if (oldValue >= 0)
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return -(oldValue % shiftStep);
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else
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return (-oldValue - 1) % shiftStep + 1 - shiftStep;
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}
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else
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{
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shiftStep = -shiftStep;
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if (oldValue >= 0)
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return shiftStep - ((oldValue - 1) % shiftStep + 1);
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else
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return (-oldValue) % shiftStep;
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}
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}
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/******************************************************************************
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* Find which spin widget button a mouse event is in.
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*/
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int SpinBox::whichButton(const TQPoint& pos)
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{
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if (upRect().contains(pos))
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return UP;
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if (downRect().contains(pos))
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return DOWN;
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return NO_BUTTON;
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}
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