Implement find dialog

This dialog consolidates options for searching through textual elements
in lists which simplifies the logic present in the MainWindow class.

1 files changed, 134 insertions, 0 deletions

diff --git a/src/finddialog.cpp b/src/finddialog.cpp
new file mode 100644
index 0000000..4de17d0
--- /dev/null
+++ b/src/finddialog.cpp
@@ -0,0 +1,134 @@
+#include "finddialog.h"
+#include "./ui_finddialog.h"
+
+#include <QListWidgetItem>
+#include <QTimer>
+#include <QDebug>
+#include <qnamespace.h>
+#include <qtimer.h>
+
+FindDialog::FindDialog(QWidget* parent)
+    : QDialog(parent, Qt::Tool), ui(new Ui::FindDialog)
+{
+    ui->setupUi(this);
+}
+
+FindDialog::~FindDialog() {
+    delete ui;
+}
+
+void FindDialog::on_buttonSearchPrev_clicked() {
+    if (--selected_match < 0) {
+        selected_match = total_matches - 1;
+        ui->statusLabel->setText(tr("Reached top, continued from bottom."));
+    } else update_status();
+    select_match();
+}
+
+void FindDialog::on_buttonSearchNext_clicked() {
+    if (++selected_match >= total_matches) {
+        selected_match = 0;
+        ui->statusLabel->setText(tr("Reached bottom, continued from top."));
+    } else update_status();
+    select_match();
+}
+
+// Update the textbox in the main window and search after 400 ms of no typing
+void FindDialog::on_textInputSearch_textEdited(const QString &text) {
+    emit search_text_changed(text);
+    static QTimer* differed_search = new QTimer(this);
+    if (static bool timer_init_done = false; not timer_init_done) {
+        differed_search->setTimerType(Qt::CoarseTimer);
+        differed_search->setSingleShot(true);
+        differed_search->setInterval(400);
+        connect(differed_search, &QTimer::timeout, this, &FindDialog::run_search);
+        timer_init_done = true;
+    }
+    differed_search->start();
+}
+
+void FindDialog::set_search_text(const QString &text) {
+    ui->textInputSearch->setText(text);
+}
+
+inline void FindDialog::run_search() {
+    init_search();
+}
+
+void FindDialog::on_hSlider_valueChanged(int value) {
+    selected_match = value;
+    update_status();
+    select_match();
+}
+
+void FindDialog::on_spinBox_valueChanged(int value) {
+    // Avoids repeatedly changing the selected_match as the valueChanged signal is a notifier for the spin box's value
+    if (not value_changed_processed) {
+        selected_match = value - 1;
+        update_status();
+        select_match();
+    }
+    value_changed_processed = false;
+}
+
+void FindDialog::set_qlist_widget(QListWidget* widget) {
+    list_widget = widget;
+}
+
+// Start a new search only if the search text input has changed
+void FindDialog::init_search() {
+    QString current_search = ui->textInputSearch->text();
+    if (*last_search == current_search or not list_widget) return;
+
+    matches = list_widget->findItems(current_search, Qt::MatchContains);
+
+    *last_search = current_search;
+    selected_match = 0;
+    total_matches = matches.size();
+
+    if (total_matches > 0) {
+        ui->hSlider->setEnabled(true);
+        ui->spinBox->setEnabled(true);
+        ui->buttonSearchPrev->setEnabled(true);
+        ui->buttonSearchNext->setEnabled(true);
+    } else {
+        ui->spinBox->setEnabled(false);
+        ui->hSlider->setEnabled(false);
+        ui->buttonSearchPrev->setEnabled(false);
+        ui->buttonSearchNext->setEnabled(false);
+    }
+
+    // Set the minimum as when there are no matches, the widget would return out of range index values to having an out of range minimum.
+    ui->hSlider->setMinimum(0);
+    ui->spinBox->setMinimum(1);
+    ui->hSlider->setMaximum(total_matches - 1);
+    ui->spinBox->setMaximum(total_matches);
+
+    select_match();
+    update_status();
+}
+
+// Activate the match requested by the user
+void FindDialog::select_match() {
+    if (list_widget and total_matches != 0 and selected_match >= 0) {
+        list_widget->scrollToItem(matches[selected_match], QAbstractItemView::EnsureVisible);
+        list_widget->setCurrentItem(matches[selected_match]);
+        emit item_selected(matches[selected_match]);
+    }
+
+    // Best place to update these sliders as select_match is always called by each input
+    ui->hSlider->setValue(selected_match);
+    ui->spinBox->setValue(selected_match + 1);
+    value_changed_processed = true;
+}
+
+// Update the status line with current search information
+void FindDialog::update_status() {
+    if (total_matches > 0) {
+        ui->statusLabel->setText(tr("Search result %1 out of %2.")
+                                    .arg(selected_match+1)
+                                    .arg(total_matches));
+    } else ui->statusLabel->setText(tr("No search results."));
+}
+
+