created directory for dialogs

src/widgets/dialogs/TextInputDialog.cpp

@@ -0,0 +1,46 @@
+#include "widgets/dialogs/TextInputDialog.hpp"
+#include <QSizePolicy>
+
+namespace chatterino {
+namespace widgets {
+
+TextInputDialog::TextInputDialog(QWidget *parent)
+    : QDialog(parent)
+    , _vbox(this)
+    , _okButton("OK")
+    , _cancelButton("Cancel")
+{
+    _vbox.addWidget(&_lineEdit);
+    _vbox.addLayout(&_buttonBox);
+    _buttonBox.addStretch(1);
+    _buttonBox.addWidget(&_okButton);
+    _buttonBox.addWidget(&_cancelButton);
+
+    QObject::connect(&_okButton, SIGNAL(clicked()), this, SLOT(okButtonClicked()));
+    QObject::connect(&_cancelButton, SIGNAL(clicked()), this, SLOT(cancelButtonClicked()));
+
+    setSizePolicy(QSizePolicy::Fixed, QSizePolicy::Fixed);
+
+    setWindowFlags((windowFlags() & ~(Qt::WindowContextHelpButtonHint)) | Qt::Dialog |
+                   Qt::MSWindowsFixedSizeDialogHint);
+}
+
+void TextInputDialog::okButtonClicked()
+{
+    accept();
+    close();
+}
+
+void TextInputDialog::cancelButtonClicked()
+{
+    reject();
+    close();
+}
+
+void TextInputDialog::highlightText()
+{
+    this->_lineEdit.selectAll();
+}
+
+}  // namespace widgets
+}  // namespace chatterino