Qt 键按事件处理程序仅在按下 ctrl、alt 或 shift 键时做出反应
Qt keyPressEvent handler only reacts when ctrl, alt or shift key is pressed
我试图使用keyPressEvent((函数获取任何键，但我在调试模式下发现只有在按下键">shift/alt/ctrl"时才调用此函数。我尝试按文本编辑框中的键。
提示管理器.h ：
namespace Ui {
class TipManager;
}
class TipManager : public QWidget
{
Q_OBJECT
public:
explicit TipManager(QWidget *parent = 0);
~TipManager();
...
protected:
virtual void keyPressEvent(QKeyEvent*);
...
private:
void on_titleEdit_textChanged(const QString &title);
void on_codeTextEdit_textChanged();
void on_memoTextEdit_textChanged();
void enableButtons();
...
private:
Ui::TipManager *ui;
...
QDirModel *model;
};
#endif // TIPMANAGER_H
提示管理器.cpp ：
#include "tipmanager.h"
#include "ui_tipmanager.h"
TipManager::TipManager(QWidget *parent) :
QWidget(parent),
ui(new Ui::TipManager)
{
ui->setupUi(this);
ui->dirEdit->setReadOnly(true);
...
}
...
void TipManager::enableButtons()
{
//disable new button when all text boxes are empty
flagTitleEdit|flagCodeTextEdit|flagMemoTextEdit
? ui->newButton->setEnabled(true)
: ui->newButton->setEnabled(false);
//enable save button when only both title and codeText bit are true
flagTitleEdit&flagCodeTextEdit
? ui->saveButton->setEnabled(true)
: ui->saveButton->setEnabled(false);
//enable edit button when even a single text box is not empty
flagTitleEdit|flagCodeTextEdit|flagMemoTextEdit
? ui->editButton->setEnabled(true)
: ui->editButton->setEnabled(false);
}
void TipManager::on_titleEdit_textChanged(const QString &title)
{
//when title text is empty, title bit is false
QString text = title;
text.trimmed().isEmpty() ? flagTitleEdit = false
: flagTitleEdit = true;
//memo title edit is modified
flagModified = true;
enableButtons();
}
void TipManager::on_codeTextEdit_textChanged()
{
//when code text is empty, codeText bit is false
QString text = ui->codeTextEdit->toPlainText();
text.trimmed().isEmpty() ? flagCodeTextEdit = false
: flagCodeTextEdit = true;
//code text edit is modified
flagModified = true;
enableButtons();
}
void TipManager::on_memoTextEdit_textChanged()
{
//when memo text is empty, memoText bit is false
QString text = ui->memoTextEdit->toPlainText();
text.trimmed().isEmpty() ? flagMemoTextEdit = false
: flagMemoTextEdit = true;
//memo text edit is modified
flagModified = true;
enableButtons();
}
void TipManager::keyPressEvent(QKeyEvent *event)
{
if(event->key() == Qt::Key_Tab)
{
}
}
tipmanager.ui ：
<?xml version="1.0" encoding="UTF-8"?>
<ui version="4.0">
<class>TipManager</class>
<widget class="QWidget" name="TipManager">
<property name="geometry">
<rect>
<x>0</x>
<y>0</y>
<width>900</width>
<height>558</height>
</rect>
</property>
<property name="sizePolicy">
<sizepolicy hsizetype="MinimumExpanding" vsizetype="Preferred">
<horstretch>0</horstretch>
<verstretch>0</verstretch>
</sizepolicy>
</property>
<property name="minimumSize">
<size>
<width>720</width>
<height>0</height>
</size>
</property>
<property name="windowTitle">
<string>TipManager</string>
</property>
<layout class="QGridLayout" name="gridLayout">
<item row="0" column="1">
<widget class="Line" name="line">
<property name="enabled">
<bool>true</bool>
</property>
<property name="orientation">
<enum>Qt::Vertical</enum>
</property>
</widget>
</item>
<item row="0" column="2">
<widget class="QWidget" name="RightLayout" native="true">
<property name="sizePolicy">
<sizepolicy hsizetype="Fixed" vsizetype="Preferred">
<horstretch>0</horstretch>
<verstretch>0</verstretch>
</sizepolicy>
</property>
<layout class="QVBoxLayout" name="rightLayout">
<property name="spacing">
<number>10</number>
</property>
<property name="sizeConstraint">
<enum>QLayout::SetMinimumSize</enum>
</property>
<property name="leftMargin">
<number>1</number>
</property>
<item>
<layout class="QVBoxLayout" name="verticalLayout_3">
<item>
<widget class="QLabel" name="label_memo">
<property name="text">
<string>Memo</string>
</property>
</widget>
</item>
<item>
<widget class="QTextEdit" name="memoTextEdit">
<property name="enabled">
<bool>true</bool>
</property>
<property name="minimumSize">
<size>
<width>0</width>
<height>0</height>
</size>
</property>
<property name="cursor" stdset="0">
<cursorShape>IBeamCursor</cursorShape>
</property>
</widget>
</item>
</layout>
</item>
<item>
<layout class="QVBoxLayout" name="verticalLayout_2">
<item>
<layout class="QHBoxLayout" name="horizontalLayout_3">
<item>
<widget class="QLabel" name="label_file">
<property name="text">
<string>File</string>
</property>
</widget>
</item>
<item>
<widget class="QLineEdit" name="dirEdit">
<property name="minimumSize">
<size>
<width>0</width>
<height>0</height>
</size>
</property>
<property name="cursor">
<cursorShape>ArrowCursor</cursorShape>
</property>
<property name="mouseTracking">
<bool>false</bool>
</property>
<property name="acceptDrops">
<bool>false</bool>
</property>
</widget>
</item>
</layout>
</item>
<item>
<widget class="QTreeView" name="treeView">
<property name="minimumSize">
<size>
<width>0</width>
<height>0</height>
</size>
</property>
<property name="cursor" stdset="0">
<cursorShape>ArrowCursor</cursorShape>
</property>
</widget>
</item>
</layout>
</item>
<item>
<layout class="QVBoxLayout" name="verticalLayout">
<item>
<layout class="QHBoxLayout" name="horizontalLayout">
<item>
<widget class="QPushButton" name="newButton">
<property name="enabled">
<bool>false</bool>
</property>
<property name="text">
<string>New</string>
</property>
</widget>
</item>
<item>
<widget class="QPushButton" name="editButton">
<property name="enabled">
<bool>false</bool>
</property>
<property name="text">
<string>Edit</string>
</property>
</widget>
</item>
<item>
<widget class="QPushButton" name="searchButton">
<property name="text">
<string>Search</string>
</property>
</widget>
</item>
</layout>
</item>
<item>
<layout class="QHBoxLayout" name="horizontalLayout_2">
<item>
<widget class="QPushButton" name="loadButton">
<property name="text">
<string>Load Dir</string>
</property>
</widget>
</item>
<item>
<widget class="QPushButton" name="saveButton">
<property name="enabled">
<bool>false</bool>
</property>
<property name="text">
<string>Save</string>
</property>
</widget>
</item>
<item>
<widget class="QPushButton" name="aboutButton">
<property name="enabled">
<bool>false</bool>
</property>
<property name="text">
<string>About</string>
</property>
</widget>
</item>
</layout>
</item>
</layout>
</item>
</layout>
</widget>
</item>
<item row="0" column="0">
<widget class="QWidget" name="LeftLayout" native="true">
<property name="sizePolicy">
<sizepolicy hsizetype="Minimum" vsizetype="Preferred">
<horstretch>0</horstretch>
<verstretch>0</verstretch>
</sizepolicy>
</property>
<property name="minimumSize">
<size>
<width>550</width>
<height>480</height>
</size>
</property>
<layout class="QVBoxLayout" name="leftLayout">
<property name="spacing">
<number>10</number>
</property>
<property name="sizeConstraint">
<enum>QLayout::SetMinAndMaxSize</enum>
</property>
<property name="leftMargin">
<number>1</number>
</property>
<property name="rightMargin">
<number>1</number>
</property>
<item>
<layout class="QVBoxLayout" name="verticalLayout_4">
<item>
<widget class="QLabel" name="label">
<property name="text">
<string>Title</string>
</property>
</widget>
</item>
<item>
<widget class="QLineEdit" name="titleEdit">
<property name="enabled">
<bool>true</bool>
</property>
<property name="minimumSize">
<size>
<width>0</width>
<height>0</height>
</size>
</property>
</widget>
</item>
</layout>
</item>
<item>
<layout class="QVBoxLayout" name="verticalLayout_5">
<item>
<widget class="QLabel" name="label_code">
<property name="text">
<string>Code</string>
</property>
</widget>
</item>
<item>
<widget class="QTextEdit" name="codeTextEdit">
<property name="enabled">
<bool>true</bool>
</property>
<property name="minimumSize">
<size>
<width>0</width>
<height>0</height>
</size>
</property>
<property name="cursor" stdset="0">
<cursorShape>IBeamCursor</cursorShape>
</property>
</widget>
</item>
</layout>
</item>
</layout>
</widget>
</item>
</layout>
</widget>
<layoutdefault spacing="6" margin="11"/>
<resources/>
<connections/>
</ui>
我当然宣布#include <QKeyEvent>，也写了setFocusPolicy()但没有帮助。 我正在使用带有对话框的 UI，所以不是在MainWindows的情况下. 我想知道为什么这只检测 shift/alt/ctrl键。 我正在使用Qt 5.3。
如果要在单击codeTextEdit时捕获键，则必须实现事件过滤器，如下所示：
提示管理器.h
#ifndef TIPMANAGER_H
#define TIPMANAGER_H
#include <QWidget>
namespace Ui {
class TipManager;
}
class TipManager : public QWidget
{
Q_OBJECT
public:
explicit TipManager(QWidget *parent = 0);
~TipManager();
bool eventFilter(QObject *watched, QEvent *event);
private:
Ui::TipManager *ui;
};
#endif // TIPMANAGER_H
提示管理器.cpp
#include "tipmanager.h"
#include "ui_tipmanager.h"
#include <QKeyEvent>
#include <QTextEdit>
#include <QDebug>
TipManager::TipManager(QWidget *parent) :
QWidget(parent),
ui(new Ui::TipManager)
{
ui->setupUi(this);
ui->codeTextEdit->installEventFilter(this);
}
TipManager::~TipManager()
{
delete ui;
}
bool TipManager::eventFilter(QObject *watched, QEvent *event)
{
if(watched == ui->codeTextEdit && event->type() == QEvent::KeyPress){
QKeyEvent *keyEvent = static_cast<QKeyEvent *>(event);
qDebug()<<keyEvent->key();
}
return QWidget::eventFilter(watched, event);
}
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