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https://github.com/miek/inspectrum.git
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ec7c42a38c
Enables mouse tracking on PlotView to get mouse move events even when not dragging. Passes through Leave events to handle the case where the cursor is near the edge of the widget and the mouse leaves the widget without generating a mouse move event that isn't on the cursor. Passes in mouse cursor shape to Cursor to define whether it should be a horizontal resize, vertical resize or move (resize all). Qt handles the case where the cursor is dragged off screen and does not generate a Leave event while draggin (<3 Qt).
89 lines
2.7 KiB
C++
89 lines
2.7 KiB
C++
/*
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* Copyright (C) 2016, Mike Walters <mike@flomp.net>
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*
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* This file is part of inspectrum.
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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 3 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
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <QApplication>
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#include "cursor.h"
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Cursor::Cursor(Qt::Orientation orientation, Qt::CursorShape mouseCursorShape, QObject * parent) : QObject::QObject(parent), orientation(orientation), cursorShape(mouseCursorShape)
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{
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}
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int Cursor::fromPoint(QPoint point)
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{
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return (orientation == Qt::Vertical) ? point.x() : point.y();
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}
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bool Cursor::pointOverCursor(QPoint point)
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{
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const int margin = 5;
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range_t<int> range = {cursorPosition - margin, cursorPosition + margin};
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return range.contains(fromPoint(point));
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}
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bool Cursor::mouseEvent(QEvent::Type type, QMouseEvent event)
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{
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// If the mouse pointer moves over a cursor, display a resize pointer
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if (pointOverCursor(event.pos()) && type != QEvent::Leave) {
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if (!cursorOverrided) {
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cursorOverrided = true;
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QApplication::setOverrideCursor(QCursor(cursorShape));
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}
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// Restore pointer if it moves off the cursor, or leaves the widget
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} else if (cursorOverrided) {
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cursorOverrided = false;
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QApplication::restoreOverrideCursor();
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}
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// Start dragging on left mouse button press, if over a cursor
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if (type == QEvent::MouseButtonPress) {
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if (event.button() == Qt::LeftButton) {
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if (pointOverCursor(event.pos())) {
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dragging = true;
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return true;
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}
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}
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// Update current cursor positon if we're dragging
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} else if (type == QEvent::MouseMove) {
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if (dragging) {
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cursorPosition = fromPoint(event.pos());
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emit posChanged();
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}
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// Stop dragging on left mouse button release
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} else if (type == QEvent::MouseButtonRelease) {
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if (event.button() == Qt::LeftButton && dragging) {
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dragging = false;
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return true;
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}
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}
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return false;
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}
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int Cursor::pos()
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{
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return cursorPosition;
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}
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void Cursor::setPos(int newPos)
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{
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cursorPosition = newPos;
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}
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