added text edit dialog to text effect

dialogs/texteditdialog.cpp

@@ -0,0 +1,36 @@
+#include "texteditdialog.h"
+
+#include <QVBoxLayout>
+#include <QPlainTextEdit>
+#include <QDialogButtonBox>
+
+TextEditDialog::TextEditDialog(QWidget *parent, const QString &s) :
+	QDialog(parent)
+{
+	setWindowTitle("Edit Text");
+
+	QVBoxLayout* layout = new QVBoxLayout();
+	setLayout(layout);
+
+	textEdit = new QPlainTextEdit();
+	textEdit->setPlainText(s);
+	layout->addWidget(textEdit);
+
+	QDialogButtonBox* buttons = new QDialogButtonBox(QDialogButtonBox::Ok | QDialogButtonBox::Cancel);
+	layout->addWidget(buttons);
+	connect(buttons, SIGNAL(accepted()), this, SLOT(save()));
+	connect(buttons, SIGNAL(rejected()), this, SLOT(cancel()));
+}
+
+const QString& TextEditDialog::get_string() {
+	return result_str;
+}
+
+void TextEditDialog::save() {
+	result_str = textEdit->toPlainText();
+	accept();
+}
+
+void TextEditDialog::cancel() {
+	reject();
+}