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#include <QtUiTools>
#include <QtWidgets>
#include "textfinder.h"

//! [0]
def __init__(self, parent = None):
    QWidget.__init__(self. parent)
    formWidget = self.loadUiFile()

//! [1]
    self.ui_findButton = qFindChild(QPushButton, self, "findButton")
    self.ui_textEdit = qFindChild(QTextEdit, self, "textEdit")
    self.ui_lineEdit = qFindChild(QLineEdit, self, "lineEdit")
//! [0] //! [1]

//! [2]
    QMetaObject.connectSlotsByName(self)
//! [2]

//! [3a]
    self.loadTextFile()
//! [3a]

//! [3b]
    layout = QVBoxLayout()
    layout.addWidget(formWidget)
    self.setLayout(layout)
//! [3b]

//! [3c]
    self.setWindowTitle("Text Finder")
    self.isFirstTime = True
//! [3c]

//! [4]
def loadUiFile(self):
    loader = QUiLoader()
    return loader.load(":/forms/textfinder.ui", self)
//! [4]

//! [5]
def loadTextFile(self):
    inputFile = QFile(":/forms/input.txt")
    inputFile.open(QIODevice.ReadOnly)
    in = QTextStream(inputFile)
    line = in.readAll()
    inputFile.close()

    self.ui_textEdit.append(line)
    self.ui_textEdit.setUndoRedoEnabled(False)
    self.ui_textEdit.setUndoRedoEnabled(True)
//! [5]

//! [6] //! [7]
@Slot()
def on_findButton_clicked(self):
    searchString = self.ui_lineEdit.text()
    document = self.ui_textEdit.document()

    found = False

    if not self.isFirstTime:
        document.undo()

    if not searchString:
        QMessageBox.information(self, "Empty Search Field",
                "The search field is empty. Please enter a word and click Find.")
    else:
        highlightCursor = QTextCursor(document)
        cursor = QTextCursor(document)
        cursor.beginEditBlock()
//! [6]
        plainFormat = QTextCharFormat(highlightCursor.charFormat())
        colorFormat = QTextCharFormat(plainFormat)
        colorFormat.setForeground(Qt.red)

        while not highlightCursor.isNull() and not highlightCursor.atEnd():
            highlightCursor = document.find(searchString, highlightCursor, QTextDocument.FindWholeWords)

            if not highlightCursor.isNull():
                found = True
                highlightCursor.movePosition(QTextCursor.WordRight, QTextCursor.KeepAnchor)
                highlightCursor.mergeCharFormat(colorFormat)
//! [8]
        cursor.endEditBlock()
//! [7] //! [9]
        self.isFirstTime = False

        if not found:
            QMessageBox.information(self, "Word Not Found", "Sorry, the word cannot be found.");
//! [8] //! [9]
