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fix lcd display, do not create multiple Calculator objects (and threads)

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This commit is contained in:
Jeff Wang 2019-04-04 01:32:15 -04:00
parent a37b754dd5
commit 9484dc01fc
4 changed files with 17 additions and 16 deletions
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12
qt_gui/calculator.cpp
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@ -8,13 +8,14 @@ Calculator::Calculator(QObject *parent) :
m_lcdText("calculator initial text"), m_lcdText("calculator initial text"),
m_timer(this) m_timer(this)
{ {
NewKeyEmpty = 1;
qDebug() << "Starting calculator thread"; qDebug() << "Starting calculator thread";
calc_thread.start(); calc_thread.start();
qDebug() << "calculator thread started"; qDebug() << "calculator thread started";
QObject::connect(&m_timer, &QTimer::timeout, this, &Calculator::updateLcd); QObject::connect(&m_timer, &QTimer::timeout, this, &Calculator::updateLcd);
m_timer.start(50); m_timer.start(200);
updateLcd();
} }
Calculator::~Calculator(){ Calculator::~Calculator(){
@ -51,16 +52,21 @@ void Calculator::updateLcd() {
QString tmp("lcd text:\n"); QString tmp("lcd text:\n");
const char* lcd_buf = get_lcd_buf(); const char* lcd_buf = get_lcd_buf();
for (int i = 0; i < MAX_ROWS; i++){ for (int i = 0; i < MAX_ROWS; i++){
tmp += "|";
for (int j = 0; j < MAX_CHARS_PER_LINE; j++){ for (int j = 0; j < MAX_CHARS_PER_LINE; j++){
tmp += lcd_buf[j + i*MAX_CHARS_PER_LINE]; tmp += lcd_buf[j + i*MAX_CHARS_PER_LINE];
} }
tmp += '\n'; tmp += "|\n";
} }
// qDebug() << "update lcd:" << tmp.toStdString().c_str(); // qDebug() << "update lcd:" << tmp.toStdString().c_str();
setLcdText(tmp); setLcdText(tmp);
} }
void Calculator::setLcdText(const QString &lcdText){
m_lcdText = lcdText;
emit lcdTextChanged();
}

2
qt_gui/calculator.h
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@ -29,7 +29,7 @@ public:
~Calculator(); ~Calculator();
inline QString lcdText(){return m_lcdText;} inline QString lcdText(){return m_lcdText;}
inline void setLcdText(const QString &lcdText){m_lcdText = lcdText;} void setLcdText(const QString &lcdText);
signals: signals:
void lcdTextChanged(); void lcdTextChanged();

8
qt_gui/main.cpp
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@ -1,5 +1,5 @@
#include <QApplication> #include <QApplication>
#include <QObject> #include <QFontDatabase>
#include <QQmlApplicationEngine> #include <QQmlApplicationEngine>
#include <QQmlContext> #include <QQmlContext>
#include "calculator.h" #include "calculator.h"
@ -8,13 +8,15 @@ int main(int argc, char** argv)
{ {
QApplication app(argc, argv); QApplication app(argc, argv);
qmlRegisterType<Calculator>("calculator.lcd", 1, 0, "CLcd");
QQmlApplicationEngine engine; QQmlApplicationEngine engine;
engine.load(QUrl(QStringLiteral("qrc:/main.qml"))); engine.load(QUrl(QStringLiteral("qrc:/main.qml")));
Calculator calculator; Calculator calculator;
engine.rootContext()->setContextProperty("_calculator", &calculator); engine.rootContext()->setContextProperty("_calculator", &calculator);
QFont fixedFont = QFontDatabase::systemFont(QFontDatabase::FixedFont);
fixedFont.setStyleHint(QFont::TypeWriter);
engine.rootContext()->setContextProperty("_fixedFont", fixedFont);
return app.exec(); return app.exec();
} }

11
qt_gui/main.qml
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@ -1,6 +1,5 @@
import QtQuick 2.0 import QtQuick 2.0
import QtQuick.Controls 1.0 import QtQuick.Controls 1.0
import calculator.lcd 1.0
ApplicationWindow ApplicationWindow
{ {
@ -28,11 +27,6 @@ ApplicationWindow
} }
} }
//lcd text from C++
CLcd {
id: clcd
}
//LCD //LCD
Rectangle { Rectangle {
objectName: "lcd"; objectName: "lcd";
@ -41,10 +35,9 @@ ApplicationWindow
height: 200 height: 200
Text { Text {
objectName: "lcd_text"; objectName: "lcd_text";
text: clcd.lcdText text: _calculator.lcdText
font: _fixedFont
anchors.centerIn: parent anchors.centerIn: parent
onTextChanged: clcd.lcdText = text
} }
} }