From 0b48e7301751301afbf96520ef39d8bb719eb780 Mon Sep 17 00:00:00 2001
From: daleclack <daleclack1@foxmail.com>
Date: Sun, 26 Dec 2021 00:05:54 +0800
Subject: [PATCH] Add Draw Area for image show

---
 Gtkmm3/gtk119_imageviewer2/CMakeLists.txt |  4 +--
 Gtkmm3/gtk119_imageviewer2/src/MyImage.cc | 33 +++++++++++++++++++++++
 Gtkmm3/gtk119_imageviewer2/src/MyImage.hh | 13 +++++++++
 Gtkmm3/gtk119_imageviewer2/src/MyWin.cc   | 22 +++++++++++++--
 Gtkmm3/gtk119_imageviewer2/src/MyWin.hh   |  9 ++++++-
 5 files changed, 76 insertions(+), 5 deletions(-)
 create mode 100644 Gtkmm3/gtk119_imageviewer2/src/MyImage.cc
 create mode 100644 Gtkmm3/gtk119_imageviewer2/src/MyImage.hh

diff --git a/Gtkmm3/gtk119_imageviewer2/CMakeLists.txt b/Gtkmm3/gtk119_imageviewer2/CMakeLists.txt
index f99f4ef..e9bda3d 100644
--- a/Gtkmm3/gtk119_imageviewer2/CMakeLists.txt
+++ b/Gtkmm3/gtk119_imageviewer2/CMakeLists.txt
@@ -47,9 +47,9 @@ if(WIN32)
 	set_property(SOURCE ../icon.rc APPEND PROPERTY
         OBJECT_DEPENDS ${PROJECT_SOURCE_DIR}/../icon.ico
         )
-	add_executable(${PROJECT_NAME} WIN32 ${app_WINRC} src/main.cc src/MyWin.cc)
+	add_executable(${PROJECT_NAME} WIN32 ${app_WINRC} src/main.cc src/MyWin.cc src/MyImage.cc)
 else()
-	add_executable(${PROJECT_NAME} src/main.cc src/MyWin.cc)
+	add_executable(${PROJECT_NAME} src/main.cc src/MyWin.cc src/MyImage.cc)
 
 endif(WIN32)
 
diff --git a/Gtkmm3/gtk119_imageviewer2/src/MyImage.cc b/Gtkmm3/gtk119_imageviewer2/src/MyImage.cc
new file mode 100644
index 0000000..512160e
--- /dev/null
+++ b/Gtkmm3/gtk119_imageviewer2/src/MyImage.cc
@@ -0,0 +1,33 @@
+#include "MyImage.hh"
+
+MyImage::MyImage(){
+
+}
+
+MyImage::~MyImage(){
+
+}
+
+bool MyImage::on_draw(const Cairo::RefPtr<Cairo::Context> &cr){
+    if(!image){
+        return false;
+    }
+
+    int width = image->get_width();
+    int height = image->get_height();
+
+    set_size_request(width,height);
+
+    // Draw the image in the middle of the drawing area, or (if the image is
+    // larger than the drawing area) draw the middle part of the image.
+    Gdk::Cairo::set_source_pixbuf(cr, image,
+        (width - image->get_width())/2, (height - image->get_height())/2);
+    cr->paint();
+
+    return true;
+}
+
+void MyImage::set_pixbuf(const Glib::RefPtr<Gdk::Pixbuf> &pixbuf)
+{
+    image = pixbuf;
+}
diff --git a/Gtkmm3/gtk119_imageviewer2/src/MyImage.hh b/Gtkmm3/gtk119_imageviewer2/src/MyImage.hh
new file mode 100644
index 0000000..21cd2e2
--- /dev/null
+++ b/Gtkmm3/gtk119_imageviewer2/src/MyImage.hh
@@ -0,0 +1,13 @@
+#pragma once
+
+#include <gtkmm.h>
+
+class MyImage : public Gtk::DrawingArea{
+    public:
+        MyImage();
+        virtual ~MyImage();
+        void set_pixbuf(const Glib::RefPtr<Gdk::Pixbuf> &pixbuf);
+    protected:
+        bool on_draw(const Cairo::RefPtr<Cairo::Context> &cr) override;
+        Glib::RefPtr<Gdk::Pixbuf> image;
+};
diff --git a/Gtkmm3/gtk119_imageviewer2/src/MyWin.cc b/Gtkmm3/gtk119_imageviewer2/src/MyWin.cc
index f3a547a..33f92d0 100644
--- a/Gtkmm3/gtk119_imageviewer2/src/MyWin.cc
+++ b/Gtkmm3/gtk119_imageviewer2/src/MyWin.cc
@@ -2,7 +2,8 @@
 
 MyWin::MyWin()
 :main_box(Gtk::ORIENTATION_VERTICAL,5),
-btnbox(Gtk::ORIENTATION_VERTICAL,5)
+btnbox(Gtk::ORIENTATION_HORIZONTAL,5),
+btnopen("Open Image")
 {
     //Add Widgets
     set_default_size(800,450);
@@ -13,8 +14,25 @@ btnbox(Gtk::ORIENTATION_VERTICAL,5)
     sw.add(image_area);
     main_box.pack_start(sw);
 
+    //Initalize Scale
+    m_adjustment = Gtk::Adjustment::create(1.0,0.1,10.0,0.1,0.1);
+    scale.set_default_direction(Gtk::TEXT_DIR_LTR);
+    scale.set_adjustment(m_adjustment);
+
+    //Add control widgets
+    btnbox.pack_start(scale);
+    btnbox.pack_start(btnopen,Gtk::PACK_SHRINK);
     main_box.pack_start(btnbox,Gtk::PACK_SHRINK);
+    btnopen.signal_clicked().connect(sigc::mem_fun(*this,&MyWin::btnopen_clicked));
 
     add(main_box);
     show_all_children();
-}
\ No newline at end of file
+}
+
+void MyWin::btnopen_clicked(){
+
+}
+
+void MyWin::dialog_response(int response_id){
+
+} 
diff --git a/Gtkmm3/gtk119_imageviewer2/src/MyWin.hh b/Gtkmm3/gtk119_imageviewer2/src/MyWin.hh
index 75f57e6..3f8d2fc 100644
--- a/Gtkmm3/gtk119_imageviewer2/src/MyWin.hh
+++ b/Gtkmm3/gtk119_imageviewer2/src/MyWin.hh
@@ -1,6 +1,7 @@
 #pragma once
 
 #include <gtkmm.h>
+#include "MyImage.hh"
 
 class MyWin : public Gtk::Window{
     public:
@@ -8,10 +9,16 @@ class MyWin : public Gtk::Window{
     private:
         //Child widgets
         Gtk::ScrolledWindow sw;
-        Gtk::DrawingArea image_area;
+        MyImage image_area;
         Gtk::Box main_box,btnbox;
+        Gtk::Button btnopen;
+        Gtk::Scale scale;
+        Glib::RefPtr<Gtk::Adjustment> m_adjustment;
+        Glib::RefPtr<Gtk::FileChooserNative> dialog;
 
         //Gesture control
         
         //Signal Handlers
+        void btnopen_clicked();
+        void dialog_response(int response_id);
 };