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Added text-bubble slider. This is an extension of QSlider which displays the slider value in the handle.
This commit is contained in:
Kenn Sebesta
Laurent Lalanne
parent
3b2795e2b4
commit
e3d2760f83
195
ground/gcs/src/plugins/config/textbubbleslider.cpp
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195
ground/gcs/src/plugins/config/textbubbleslider.cpp
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/**
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******************************************************************************
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*
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* @file textbubbleslider.h
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* @author Tau Labs, http://taulabs.org Copyright (C) 2013.
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* @brief Creates a slider with a text bubble showing the slider value
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* @see The GNU Public License (GPL) Version 3
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* @defgroup Config
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* @{
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*
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*****************************************************************************/
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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, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* 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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* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <QDebug>
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#include <QPainter>
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#include <QDebug>
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#include <qmath.h>
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#include "textbubbleslider.h"
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/**
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* @brief TextBubbleSlider::TextBubbleSlider Constructs a regular text-bubble slider
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* @param parent
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*/
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TextBubbleSlider::TextBubbleSlider(QWidget *parent) :
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QSlider(parent)
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{
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construct();
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}
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/**
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* @brief TextBubbleSlider::TextBubbleSlider Constructs a text-bubble slider that copys
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* all relevant data from the previous slider
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* @param copySlider
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* @param parent
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*/
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TextBubbleSlider::TextBubbleSlider(QSlider *copySlider, QWidget *parent) :
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QSlider(parent)
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{
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construct();
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// Copy settings
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setSizePolicy(copySlider->sizePolicy());
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setMinimumSize(copySlider->minimumSize());
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setMaximumSize(copySlider->maximumSize());
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setFocusPolicy(copySlider->focusPolicy());
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setOrientation(copySlider->orientation());
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setMaximum(copySlider->maximum());
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setMinimum(copySlider->minimum());
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setToolTip(copySlider->toolTip());
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}
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/**
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* @brief TextBubbleSlider::construct This function needs to be called from all constructors. It
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* provides a single point where settings can be changed.
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*/
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void TextBubbleSlider::construct()
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{
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font = QFont("Arial", 13);
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slideHandleMargin = 2; // This is a dubious way to set the margin. In reality, it should be read from the style sheet.
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}
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TextBubbleSlider::~TextBubbleSlider()
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{
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}
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/**
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* @brief numIntegerDigits Counts the number of digits in an integer
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* @param number Input integer
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* @return Number of digits in input integer
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*/
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unsigned int numIntegerDigits(int number)
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{
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unsigned int digits = 0;
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// If there is a negative sign, be sure to include it in digit count
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if (number < 0)
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digits = 1;
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while (number) {
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number /= 10;
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digits++;
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}
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return digits;
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}
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/**
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* @brief TextBubbleSlider::setMaxPixelWidth Sets maximum pixel width for slider handle
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*/
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void TextBubbleSlider::setMaxPixelWidth()
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{
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// Calculate maximum number of digits possible in string
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int maxNumDigits = numIntegerDigits(maximum()) > numIntegerDigits(minimum()) ? numIntegerDigits(maximum()) : numIntegerDigits(minimum());
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// Generate string with maximum pixel width. Suppose that "0" is
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// the widest number in pixels.
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QString maximumWidthString;
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for (int i=0; i<maxNumDigits; i++) {
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maximumWidthString.append("0");
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}
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// Calculate maximum possible pixel width for string.
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QFontMetrics fontMetrics(font);
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maximumFontWidth = fontMetrics.width(QString("%1").arg(maximumWidthString));
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maximumFontHeight = fontMetrics.height();
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// Override stylesheet slider handle width
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slideHandleWidth = maximumFontWidth + 6;
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setStyleSheet(QString("QSlider::handle:horizontal { width: %1px; margin: -5px 0;}").arg(slideHandleWidth));
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}
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/**
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* @brief TextBubbleSlider::setMinimum Reimplements setMinimum. Ensures that the slider
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* handle is the correct size for the text field.
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* @param max maximum
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*/
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void TextBubbleSlider::setMinimum(int max)
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{
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// Pass value on to QSlider
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QSlider::setMinimum(max);
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// Reset handler size
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setMaxPixelWidth();
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}
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/**
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* @brief TextBubbleSlider::setMaximum Reimplements setMaximum. Ensures that the slider
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* handle is the correct size for the text field.
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* @param max maximum
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*/
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void TextBubbleSlider::setMaximum(int max)
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{
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// Pass value on to QSlider
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QSlider::setMaximum(max);
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// Reset handler size
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setMaxPixelWidth();
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}
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/**
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* @brief TextBubbleSlider::paintEvent Reimplements QSlider::paintEvent.
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* @param bob
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*/
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void TextBubbleSlider::paintEvent(QPaintEvent *paintEvent)
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{
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// Pass paint event on to QSlider
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QSlider::paintEvent(paintEvent);
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/* Add numbers on top of handler */
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// Calculate pixel position for text.
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int sliderWidth = width();
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int sliderHeight = height();
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double valuePos;
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if (!invertedAppearance()) {
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valuePos = (slideHandleWidth - maximumFontWidth)/2 + slideHandleMargin + // First part centers text in handle...
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(value()-minimum())/(double)(maximum()-minimum()) * (sliderWidth - (slideHandleWidth + slideHandleMargin) - 1); //... and second part moves text with handle
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} else {
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valuePos = (slideHandleWidth - maximumFontWidth)/2 + slideHandleMargin + // First part centers text in handle...
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(maximum()-value())/(double)(maximum()-minimum()) * (sliderWidth - (slideHandleWidth + slideHandleMargin) - 1); //... and second part moves text with handle
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}
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// Create painter and set font
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QPainter painter(this);
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painter.setFont(font);
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// Draw neutral value text. Verically center it in the handle
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QString neutralStringWidth = QString("%1").arg(value());
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QFontMetrics fontMetrics(font);
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int textWidth = fontMetrics.width(neutralStringWidth);
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painter.drawText(QRectF(valuePos + maximumFontWidth - textWidth, ceil((sliderHeight - maximumFontHeight)/2.0), textWidth, maximumFontHeight),
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neutralStringWidth);
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}
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61
ground/gcs/src/plugins/config/textbubbleslider.h
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61
ground/gcs/src/plugins/config/textbubbleslider.h
Normal file
@ -0,0 +1,61 @@
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/**
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******************************************************************************
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*
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* @file textbubbleslider.h
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* @author Tau Labs, http://taulabs.org Copyright (C) 2013.
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* @brief Creates a slider with a text bubble showing the slider value
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* @see The GNU Public License (GPL) Version 3
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* @defgroup Config
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* @{
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*
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*****************************************************************************/
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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, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* 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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* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#ifndef TEXTBUBBLESLIDER_H
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#define TEXTBUBBLESLIDER_H
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#include <QSlider>
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#include <QtDesigner/QDesignerExportWidget>
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class QDESIGNER_WIDGET_EXPORT TextBubbleSlider : public QSlider
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{
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Q_OBJECT
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public:
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explicit TextBubbleSlider(QWidget *parent = 0);
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explicit TextBubbleSlider(QSlider *, QWidget *parent = 0);
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void construct();
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~TextBubbleSlider();
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void setMinimum(int);
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void setMaximum(int);
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protected:
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void paintEvent ( QPaintEvent * event );
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private:
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void setMaxPixelWidth();
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QFont font;
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int maximumFontWidth;
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int maximumFontHeight;
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int slideHandleWidth;
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int slideHandleMargin;
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};
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#endif // TEXTBUBBLESLIDER_H
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