我想知道是否有人能告诉我这里到底发生了什么。我已经为简单的配置对话框包含了头文件和实现文件。问题出在updateAutoSaveGroupBox插槽中,我无法访问或更改页面上我的小部件的任何属性。 I.E.如果没有选中复选框,我想禁用一些小部件,但是当我尝试设置它们时,我得到一个读取访问冲突。任何有关此事的帮助将不胜感激。这两行中存在问题(注释掉它所以它现在会运行而不会抛出异常)。
//autoSaveLabel->setDisabled(autoSaveIsEnabled);
//autoSaveSpinBox->setDisabled(getAutoSaveIsEnabled());
configWidget.h
class EnigmaConfigGeneralEnvironmentWidget : public QWidget
{
Q_OBJECT
public:
explicit EnigmaConfigGeneralEnvironmentWidget(QWidget *parent = 0);
~EnigmaConfigGeneralEnvironmentWidget();
signals:
void setAutoSaveIsEnabledSignal(bool autoSaveIsEnabled);
public slots:
void setAutoSaveIsEnabled(bool autoSaveIsEnabled){_AutoSaveIsenabled = autoSaveIsEnabled;}
bool getAutoSaveIsEnabled(){return _AutoSaveIsenabled;}
void updateAutoSaveGroupBox(bool autoSaveIsEnabled);
private:
void makeConnections();
void readSettings();
void writeSettings();
void createMainWidget();
QGroupBox *uiGroupBox;
QStringList localList;
QLabel *localLabel;
QComboBox *localeComboBox;
QHBoxLayout *localSelectionHLayout;
QGroupBox *systemGroupBox;
QCheckBox *autoSaveCheckBox;
QLabel *autoSaveLabel;
QSpinBox *autoSaveSpinBox;
QHBoxLayout *autoSaveHLayout;
bool _AutoSaveIsenabled;
};
ConfigWidget.cpp
#include "enigmaconfiggeneralenvironmentwidget.h"
#include <QtWidgets>
EnigmaConfigGeneralEnvironmentWidget::EnigmaConfigGeneralEnvironmentWidget(QWidget *parent) :
QWidget(parent)
{
makeConnections();
readSettings();
createMainWidget();
}
EnigmaConfigGeneralEnvironmentWidget::~EnigmaConfigGeneralEnvironmentWidget()
{
writeSettings();
}
void EnigmaConfigGeneralEnvironmentWidget::makeConnections()
{connect(this,SIGNAL(setAutoSaveIsEnabledSignal(bool)),this,SLOT(setAutoSaveIsEnabled(bool)) );
connect(this,SIGNAL(setAutoSaveIsEnabledSignal(bool)),this,SLOT(updateAutoSaveGroupBox(bool)) );
}
void EnigmaConfigGeneralEnvironmentWidget::readSettings()
{
QSettings settings;
settings.beginGroup(tr("UI.Config.Environment.General"));
bool autoSaveIsEnabled = settings.value("autoSaveIsEnabled",bool(true)).toBool();
setAutoSaveIsEnabledSignal(autoSaveIsEnabled);
settings.endGroup();
}
void EnigmaConfigGeneralEnvironmentWidget::writeSettings()
{
QSettings settings;
settings.beginGroup(tr("UI.Config.Environment.General"));
settings.setValue("autoSaveIsEnabled",getAutoSaveIsEnabled());
settings.endGroup();
}
void EnigmaConfigGeneralEnvironmentWidget::createMainWidget()
{
localList.append(tr("Danish - ???"));
localList.append(tr("English - Australia"));
localList.append(tr("English - Canada"));
localList.append(tr("English - USA"));
localList.append(tr("English - UK"));
localList.append(tr("Finnish - Finland"));
localList.append(tr("French - Canada"));
localList.append(tr("French - France"));
localList.append(tr("Norwegian - ???"));
localList.append(tr("Swedish - ???"));
uiGroupBox = new QGroupBox();
uiGroupBox->setTitle(tr("UI Settings"));
localLabel= new QLabel();
localLabel->setText(tr("Select a language: "));
localeComboBox = new QComboBox();
localeComboBox->addItems(localList);
localSelectionHLayout = new QHBoxLayout(uiGroupBox);
localSelectionHLayout->addWidget(localLabel);
localSelectionHLayout->addWidget(localeComboBox);
systemGroupBox = new QGroupBox();
systemGroupBox->setTitle(tr("System Settigns"));
autoSaveCheckBox = new QCheckBox();
autoSaveCheckBox->setText(tr("Auto-Save Enabled: "));
autoSaveCheckBox->setChecked(getAutoSaveIsEnabled());
connect(autoSaveCheckBox,SIGNAL(clicked(bool)),this,SIGNAL(setAutoSaveIsEnabledSignal(bool)));
autoSaveLabel = new QLabel(this);
autoSaveLabel->setText(tr("Auto-Save Interval is Every: "));
autoSaveSpinBox = new QSpinBox();
autoSaveSpinBox->setSuffix(tr("Mins."));
autoSaveSpinBox->setAccelerated(true);
autoSaveHLayout = new QHBoxLayout(systemGroupBox);
autoSaveHLayout->addWidget(autoSaveCheckBox);
autoSaveHLayout->addWidget(autoSaveLabel);
autoSaveHLayout->addWidget(autoSaveSpinBox);
QVBoxLayout *vLayout = new QVBoxLayout(this);
vLayout->addWidget(uiGroupBox);
vLayout->addWidget(systemGroupBox);
}
void EnigmaConfigGeneralEnvironmentWidget::updateAutoSaveGroupBox(bool autoSaveIsEnabled)
{
qDebug() << "debug " << autoSaveIsEnabled;
//autoSaveLabel->setDisabled(autoSaveIsEnabled);
//autoSaveSpinBox->setDisabled(getAutoSaveIsEnabled());
}
答案 0 :(得分:1)
发现它:
void EnigmaConfigGeneralEnvironmentWidget::readSettings()
{
QSettings settings;
settings.beginGroup(tr("UI.Config.Environment.General"));
bool autoSaveIsEnabled = settings.value("autoSaveIsEnabled",bool(true)).toBool();
setAutoSaveIsEnabledSignal(autoSaveIsEnabled);
settings.endGroup();
}
你在这里(信号)呼叫void setAutoSaveIsEnabledSignal(bool)
,而不是void setAutoSaveIsEnabled(bool)
(实际的设定者)。因此,成员变量仍然未初始化。
提醒自己:不要将信号命名为设置者,例如使用void autoSaveIsEnabledChanged(bool)