From 168d0f063e97986f14c867ade88904be60068168 Mon Sep 17 00:00:00 2001
From: Werner Lemberg <wl@gnu.org>
Date: Tue, 17 Jan 2012 21:19:17 +0100
Subject: [PATCH] Handle file browse buttons.

---
 frontend/maingui.cpp | 42 ++++++++++++++++++++++++++++++++++++++----
 frontend/maingui.h   |  1 +
 2 files changed, 39 insertions(+), 4 deletions(-)

diff --git a/frontend/maingui.cpp b/frontend/maingui.cpp
index 42a30bf..b558a5d 100644
--- a/frontend/maingui.cpp
+++ b/frontend/maingui.cpp
@@ -58,12 +58,38 @@ Main_GUI::about()
 void
 Main_GUI::browse_input()
 {
+  // XXX remember last directory
+  QString file = QFileDialog::getOpenFileName(
+                   this,
+                   tr("Open Input File"),
+                   QDir::toNativeSeparators(QDir::homePath()),
+                   "");
+  if (!file.isEmpty())
+    input_line->setText(file);
 }
 
 
 void
 Main_GUI::browse_output()
 {
+  // XXX remember last directory
+  QString file = QFileDialog::getOpenFileName(
+                   this,
+                   tr("Open Output File"),
+                   QDir::toNativeSeparators(QDir::homePath()),
+                   "");
+  if (!file.isEmpty())
+    output_line->setText(file);
+}
+
+
+void
+Main_GUI::check_run()
+{
+  if (input_line->text().isEmpty() || output_line->text().isEmpty())
+    run_button->setEnabled(false);
+  else
+    run_button->setEnabled(true);
 }
 
 
@@ -166,10 +192,18 @@ Main_GUI::create_layout()
 void
 Main_GUI::create_connections()
 {
-  connect(input_button, SIGNAL(clicked()), this, SLOT(browse_input()));
-  connect(output_button, SIGNAL(clicked()), this, SLOT(browse_output()));
-
-  connect(run_button, SIGNAL(clicked()), this, SLOT(run()));
+  connect(input_button, SIGNAL(clicked()), this,
+          SLOT(browse_input()));
+  connect(output_button, SIGNAL(clicked()), this,
+          SLOT(browse_output()));
+
+  connect(input_line, SIGNAL(textChanged(QString)), this,
+          SLOT(check_run()));
+  connect(output_line, SIGNAL(textChanged(QString)), this,
+          SLOT(check_run()));
+
+  connect(run_button, SIGNAL(clicked()), this,
+          SLOT(run()));
 }
 
 
diff --git a/frontend/maingui.h b/frontend/maingui.h
index 4ff5545..10080bd 100644
--- a/frontend/maingui.h
+++ b/frontend/maingui.h
@@ -40,6 +40,7 @@ private slots:
   void about();
   void browse_input();
   void browse_output();
+  void check_run();
   void run();
 
 private:
-- 
2.11.4.GIT