QT 输入框

这几天在用QT做项目，遇到键盘问题。项目是用在window 10 平板。手指点击输入框window自带的键盘就会弹出，而且会遮挡界面，window键盘找不到任何接口，不支持定制，透明度不能调，大小不能调。最可气的是点击输入框毕弹出，遮挡自己写的键盘，又不能关闭触屏弹出键盘。

经过多次多次测试，发现把当前窗口设置焦点，让输入框失去焦点，系统键盘就会退出，然后手动设置输入框为焦点。想想是不是很好呀，只是猜测，还要明天去公司验证。

或者在view层对点击事件进行拦截不让点击事件传入输入框内，然后手动设置输入框为焦点。

window禁用输入法

测试发现只要点击的位置位于输入框区间内，就算把所有事件都拦截（输入框已经无法绘制出来了），系统键盘照样弹出，真想骂人！！！看来拦截事件是行不通了。
只能上笨办法了，在输入框位置绘制一个遮罩，遮罩只能使用Qt::Tool类型窗口，而且不能有继承或者同父类。创建一个透明按钮绘制在输入框上面只会是一片黑。因为是置顶遮罩，存在界面切换需要隐藏遮罩，所以还定义了一个单例通知类，关于键盘可以看我的另外一篇博客。

#pragma once#include <QLineEdit>
#include <QDebug>
#include <QTimer>
#include <QPoint>
#include <QMouseEvent>
#include "KeyBoard.h"#ifdef WIN32
#include <windows.h>
#endif
//代理类，接收/发送信号
class SignalSwitech : public QObject
{Q_OBJECTsignals:void signalClearFocus();void signalUpdate();void signalHideMaskEffect(bool isHide);public:static SignalSwitech* Instance();void clearFocus() { emit signalClearFocus(); }void setIMM(bool b) { mUseIMM = b; }bool useIMM() { return mUseIMM; }void update() { emit signalUpdate(); };void hideMaskEffect(bool isHide) { emit signalHideMaskEffect(isHide); }private:SignalSwitech() {};virtual ~SignalSwitech() {};private:static SignalSwitech *mInstance;bool mUseIMM = false; //是否使用过IMM来控制键盘弹出/隐藏
};
//遮罩
class MaskEffect : public QWidget
{Q_OBJECTpublic:MaskEffect(QWidget *masked); // 必须无父窗口，所以传给基类为nullptrvirtual ~MaskEffect();public:public slots:void updateView();void hideMaskEffect(bool isHide);protected:bool eventFilter(QObject* target, QEvent* ev) override;virtual void showEvent(QShowEvent *event) override;private:QWidget *mMaskedWidget = nullptr; //被遮罩控件QRect mScreenRect;QTimer *mTimer = nullptr;
};//输入框
class FXLineEdit : public QLineEdit
{Q_OBJECTpublic:FXLineEdit(QWidget *parent = nullptr);virtual ~FXLineEdit();public:/*强制系统键盘为英文输入法*/void setEnglishInputMethod(bool isEn = false);/*是否开启遮罩*/void setMaskEffect(bool isEffect = true);/*自定义键盘输入法*/void setIMMode(int IMMode = 0);/*显示输入框即显示键盘*/void setStartShowKB(int showKB);/*禁用系统输入法*/void disableSysIME();protected:bool eventFilter(QObject* target, QEvent* event) override;void showEvent(QShowEvent *event) override;public:
signals:void signalClose();/*通知系统键盘弹出*/void signalSysKBShow(const bool& isShow = false);private:
#ifdef WIN32HKL hCurKL = NULL;
#endifKeyBoard *mKeyboard = nullptr;int mIMMode = -1;//键盘类型具体可见键盘类KeyBoard.hbool mStartShowKB = false;//首次进入输入框处于焦点状态即显示键盘bool mIsEnglishIM = false;//是否开启英文输入法bool mIsEffect = false; //是否开启遮罩MaskEffect *mMaskEffect = nullptr;
};

#include <QApplication>
#include <QProcess>
#include <QFileInfo>
#include <QDesktopWidget>
#include <QMainWindow>
#include <QDesktopServices>
#include "FXLineEdit.h"#ifdef WIN32
#include <imm.h>
#pragma comment(lib, "imm32.lib ")
#endifSignalSwitech* SignalSwitech::mInstance = nullptr;SignalSwitech* SignalSwitech::Instance()
{if (mInstance == nullptr){mInstance = new SignalSwitech();}return mInstance;
}///- MaskEffect -///MaskEffect::MaskEffect(QWidget *masked) : QWidget(nullptr) // 无父窗口，所以传给基类为nullptr
{this->setWindowTitle("MaskEffect");QDesktopWidget* desktopWidget = QApplication::desktop();mScreenRect = desktopWidget->screenGeometry();Q_ASSERT(masked != nullptr);mMaskedWidget = masked;this->setAttribute(Qt::WA_DeleteOnClose);//初始化窗口属性this->setWindowOpacity(0.1);  //达到比较好的淡出效果，需要将窗口设置完全透明，否则会有卡顿的效果this->setWindowFlags(Qt::Window | Qt::WindowTitleHint | Qt::FramelessWindowHint | Qt::Tool | Qt::WindowDoesNotAcceptFocus | Qt::WindowStaysOnTopHint);this->setStyleSheet("background: white;");this->setFocusPolicy(Qt::FocusPolicy::NoFocus);this->installEventFilter(this);connect(SignalSwitech::Instance(), &SignalSwitech::signalUpdate, this, &MaskEffect::updateView);connect(SignalSwitech::Instance(), &SignalSwitech::signalHideMaskEffect, this, &MaskEffect::hideMaskEffect);
}void MaskEffect::hideMaskEffect(bool isHide)
{if (isHide){this->hide();SignalSwitech::Instance()->clearFocus();//清除输入框焦点}else{this->show();updateView();}
}MaskEffect:: ~MaskEffect()
{disconnect(SignalSwitech::Instance(), &SignalSwitech::signalUpdate, this, &MaskEffect::updateView);disconnect(SignalSwitech::Instance(), &SignalSwitech::signalHideMaskEffect, this, &MaskEffect::hideMaskEffect);this->removeEventFilter(this);
}bool MaskEffect::eventFilter(QObject* target, QEvent* ev)
{switch (ev->type()){case QEvent::Paint:case QEvent::Timer:case QEvent::ToolTip:break;default://qDebug() << "eventFilter" << ev->type();break;}switch (ev->type()){//case QEvent::HoverMove://case QEvent::MouseMove://case QEvent::InputMethodQuery://case QEvent::FocusIn://case QEvent::Enter: //初始化会发送这些事件导致键盘弹出//case QEvent::TouchBegin://case QEvent::MouseButtonPress:case QEvent::MouseButtonRelease:{QPoint p = this->mapFromGlobal(QCursor::pos());//鼠标位置QMouseEvent me(QMouseEvent::MouseButtonRelease, p, Qt::LeftButton, Qt::LeftButton, Qt::NoModifier);QCoreApplication::sendEvent(mMaskedWidget, &me);mMaskedWidget->setEnabled(true);mMaskedWidget->setFocus();}break;default:break;}return QWidget::eventFilter(target, ev);
}void MaskEffect::showEvent(QShowEvent *event)
{if (mMaskedWidget == nullptr){return;}QRegion region = mMaskedWidget->visibleRegion();QRect rect = region.boundingRect();QPoint p = mMaskedWidget->mapToGlobal(rect.topLeft());qDebug() << p;qDebug() << rect;this->move(p);this->setFixedSize(rect.size());
}void MaskEffect::updateView()
{if (mMaskedWidget == nullptr){return;}QRegion region = mMaskedWidget->visibleRegion();QRect rect = region.boundingRect();QPoint p = mMaskedWidget->mapToGlobal(rect.topLeft());qDebug() << p;qDebug() << rect;this->move(p);this->setFixedSize(rect.size());
}- FXLineEdit -//FXLineEdit::FXLineEdit(QWidget *parent) : QLineEdit(parent)
{this->setObjectName("FXLineEdit");this->installEventFilter(this);this->setStyleSheet("background-color:rgb(255,255,255);");//this->setAttribute(Qt::WA_InputMethodEnabled, false);
}FXLineEdit::~FXLineEdit()
{if (mMaskEffect != nullptr){delete mMaskEffect;mMaskEffect = nullptr;}this->clearFocus();this->removeEventFilter(this);#ifdef WIN32HWND hWnd = ::FindWindow(L"IPTip_Main_Window", NULL);if (hWnd){::PostMessage(hWnd, WM_SYSCOMMAND, SC_CLOSE, 0); //关闭键盘}
#endifif (nullptr != mKeyboard){delete mKeyboard;mKeyboard = nullptr;}
}void FXLineEdit::disableSysIME()
{#ifdef WIN320SignalSwitech::Instance()->setIMM(true);// 屏蔽系统键盘HWND hWnd = (HWND)this->winId();HIMC _IMC = ImmGetContext(hWnd);if (hWnd && IsWindow(hWnd)){ImmAssociateContext(hWnd, NULL);ImmSetOpenStatus(_IMC, FALSE);if (!ImmReleaseContext(hWnd, _IMC)){qDebug() << "ImmReleaseContext call failed!";}}
#endif // WIN32
}void FXLineEdit::setMaskEffect(bool isEffect)
{mIsEffect = isEffect;connect(SignalSwitech::Instance(), &SignalSwitech::signalClearFocus, this, [=](){this->clearFocus();this->setDisabled(true);if (mKeyboard != nullptr){mKeyboard->hide();mKeyboard->close();delete mKeyboard;mKeyboard = nullptr;}});
}void FXLineEdit::setEnglishInputMethod(bool isEn)
{mIsEnglishIM = isEn;
}void FXLineEdit::setIMMode(int IMMode)
{mIMMode = IMMode;mKeyboard = new KeyBoard(nullptr, IMMode);mKeyboard->BindingEdit(this);
}void FXLineEdit::setStartShowKB(int showKB)
{mStartShowKB = showKB;
}void FXLineEdit::showEvent(QShowEvent *event)
{if (mIsEffect){if (mMaskEffect == nullptr){mMaskEffect = new MaskEffect(this);mMaskEffect->show();}}if (this->hasFocus() && mStartShowKB){mKeyboard->show();}
}bool FXLineEdit::eventFilter(QObject* target, QEvent* ev)
{switch (ev->type()){case QEvent::Paint:case QEvent::Timer:case QEvent::ToolTip:break;default:SignalSwitech::Instance()->update();qDebug() << "FXLineEdit::eventFilter " << ev->type();break;}switch (ev->type()){//case QEvent::TouchBegin://case QEvent::MouseButtonPress:case QEvent::MouseButtonRelease:{if (mIsEffect){//根据鼠标位置设置光标位置QMouseEvent* me = static_cast<QMouseEvent*>(ev);this->setCursorPosition(this->cursorPositionAt(me->pos()));}if (mIMMode > -1){#ifdef WIN32HWND hWnd = ::FindWindow(L"IPTip_Main_Window", NULL);if (hWnd){::PostMessage(hWnd, WM_SYSCOMMAND, SC_CLOSE, 0); //关闭键盘}
#endifif (nullptr == mKeyboard){mKeyboard = new KeyBoard(nullptr, mIMMode);mKeyboard->BindingEdit(this);}mKeyboard->show();}else if (mIsEnglishIM || this->echoMode() == QLineEdit::Password || this->echoMode() == QLineEdit::PasswordEchoOnEdit)//强制系统键盘为英文输入法{#ifdef WIN32if (SignalSwitech::Instance()->useIMM()){QString programFilesPath(qgetenv("PROGRAMFILES").replace("\\", "/"));QString tabTipPath = QString("%1/Common Files/microsoft shared/ink/TabTip.exe").arg(programFilesPath);if (QFileInfo(tabTipPath).exists()) {QDesktopServices::openUrl(QUrl("file:///" + tabTipPath));}}hCurKL = GetKeyboardLayout(0);LoadKeyboardLayout((LPCWSTR)QString("0x0409").utf16(), KLF_ACTIVATE);
#endifemit signalSysKBShow(true);}}break;default:break;}switch (ev->type()){case QEvent::Hide:case QEvent::FocusOut:case QEvent::FocusAboutToChange: // 使用此控件界面主动清除输入焦点{if (mIMMode > -1){this->setEnabled(false);if (nullptr != mKeyboard){mKeyboard->hide();mKeyboard->close();delete mKeyboard;mKeyboard = nullptr;}}
#ifdef WIN32if (SignalSwitech::Instance()->useIMM()){HWND hWnd = ::FindWindow(L"IPTip_Main_Window", NULL);if (hWnd){::PostMessage(hWnd, WM_SYSCOMMAND, SC_CLOSE, 0); //关闭键盘}}else if (hCurKL != NULL){ActivateKeyboardLayout(hCurKL, 0); //还原输入法}
#endif}break;case QEvent::Leave:case QEvent::HoverLeave: //不能用此事件作为输入框失去焦点，因为点击键盘也会发出此消息break;case QEvent::FocusIn:break;default:break;}return QWidget::eventFilter(target, ev);     // 最后将事件交给上层对话框
}

使用

 FXLineEdit *lineEdit = new FXLineEdit(this);lineEdit->setFixedSize(100,60);lineEdit->setFont(DimensionAdapter::Instance()->getFont(FONT_LIST_CONTENT));lineEdit->setAutoFillBackground(true);lineEdit->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);lineEdit->setStyleSheet("background:white;border-width:2px;border-color:black;");lineEdit->disableSysIME();lineEdit->setMaskEffect(true);

window 10 可以通过禁用输入法来实现禁止键盘弹出测试发现部分系统下可以

#ifdef WIN32// 通过禁止所有输入法达到屏蔽系统键盘HIMC _IMC;HWND hWnd = (HWND)this->winId();_IMC = ImmGetContext(hWnd);if (hWnd && IsWindow(hWnd)) {ImmAssociateContext(hWnd, NULL);ImmReleaseContext(hWnd, _IMC);}
//启用
ImmAssociateContext(hWnd, _IMC);
#endif // WIN32

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QT 输入框禁止window10触摸屏弹出键盘

qt 输入框禁止window 10键盘弹出

QT 输入框

window禁用输入法

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