[gnome-builder/wip/gtk4-port] libide/gui: add placeholder to IdeFrame

[Christian Hergert <chergert src gnome org>]

commit 6bb433c73dfafff815f2144bf0aa719c35051c7f
Author: Christian Hergert <chergert redhat com>
Date:   Sun Apr 3 17:31:08 2022 -0700

    libide/gui: add placeholder to IdeFrame
    
    We can probably improve this longer term, but this just gets something
    similar to what we had before using AdwStatusPage.

 src/libide/gui/ide-frame.c              |  6 ++
 src/libide/gui/ide-frame.ui             | 98 +++++++++++++++++++++++++++++++++
 src/libide/gui/libide-gui.gresource.xml |  1 +
 3 files changed, 105 insertions(+)
---
diff --git a/src/libide/gui/ide-frame.c b/src/libide/gui/ide-frame.c
index 08a371023..59c76c4ca 100644
--- a/src/libide/gui/ide-frame.c
+++ b/src/libide/gui/ide-frame.c
@@ -22,6 +22,7 @@
 
 #include "config.h"
 
+#include <adwaita.h>
 #include <glib/gi18n.h>
 #include <libpeas/peas.h>
 
@@ -180,14 +181,19 @@ static void
 ide_frame_class_init (IdeFrameClass *klass)
 {
   GObjectClass *object_class = G_OBJECT_CLASS (klass);
+  GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (klass);
 
   object_class->dispose = ide_frame_dispose;
   object_class->constructed = ide_frame_constructed;
+
+  gtk_widget_class_set_template_from_resource (widget_class, "/org/gnome/libide-gui/ui/ide-frame.ui");
 }
 
 static void
 ide_frame_init (IdeFrame *self)
 {
+  gtk_widget_init_template (GTK_WIDGET (self));
+
   g_signal_connect (self,
                     "notify::visible-child",
                     G_CALLBACK (ide_frame_notify_visible_child),
diff --git a/src/libide/gui/ide-frame.ui b/src/libide/gui/ide-frame.ui
new file mode 100644
index 000000000..4027b595f
--- /dev/null
+++ b/src/libide/gui/ide-frame.ui
@@ -0,0 +1,98 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<interface>
+  <template class="IdeFrame" parent="PanelFrame">
+    <property name="placeholder">
+      <object class="AdwStatusPage" id="status">
+        <property name="title" translatable="yes">Open a File or Terminal</property>
+        <property name="description" translatable="yes">Use the page switcher above or use one of the 
following:</property>
+        <property name="child">
+          <object class="GtkGrid">
+            <property name="halign">center</property>
+            <property name="column-spacing">48</property>
+            <property name="row-spacing">6</property>
+            <child>
+              <object class="GtkLabel">
+                <property name="xalign">0</property>
+                <property name="label" translatable="yes">Search</property>
+                <layout>
+                  <property name="row">0</property>
+                  <property name="column">0</property>
+                </layout>
+              </object>
+            </child>
+            <child>
+              <object class="GtkLabel">
+                <property name="xalign">1</property>
+                <property name="label" translatable="yes">Ctrl+Enter</property>
+                <layout>
+                  <property name="row">0</property>
+                  <property name="column">1</property>
+                </layout>
+              </object>
+            </child>
+            <child>
+              <object class="GtkLabel">
+                <property name="xalign">0</property>
+                <property name="label" translatable="yes">Project Sidebar</property>
+                <layout>
+                  <property name="row">1</property>
+                  <property name="column">0</property>
+                </layout>
+              </object>
+            </child>
+            <child>
+              <object class="GtkLabel">
+                <property name="xalign">1</property>
+                <property name="label" translatable="yes">F9</property>
+                <layout>
+                  <property name="row">1</property>
+                  <property name="column">1</property>
+                </layout>
+              </object>
+            </child>
+            <child>
+              <object class="GtkLabel">
+                <property name="xalign">0</property>
+                <property name="label" translatable="yes">Open File</property>
+                <layout>
+                  <property name="row">2</property>
+                  <property name="column">0</property>
+                </layout>
+              </object>
+            </child>
+            <child>
+              <object class="GtkLabel">
+                <property name="xalign">1</property>
+                <property name="label" translatable="yes">Ctrl+O</property>
+                <layout>
+                  <property name="row">2</property>
+                  <property name="column">1</property>
+                </layout>
+              </object>
+            </child>
+            <child>
+              <object class="GtkLabel">
+                <property name="xalign">0</property>
+                <property name="label" translatable="yes">New Terminal</property>
+                <layout>
+                  <property name="row">3</property>
+                  <property name="column">0</property>
+                </layout>
+              </object>
+            </child>
+            <child>
+              <object class="GtkLabel">
+                <property name="xalign">1</property>
+                <property name="label" translatable="yes">Ctrl+Shift+T</property>
+                <layout>
+                  <property name="row">3</property>
+                  <property name="column">1</property>
+                </layout>
+              </object>
+            </child>
+          </object>
+        </property>
+      </object>
+    </property>
+  </template>
+</interface>
diff --git a/src/libide/gui/libide-gui.gresource.xml b/src/libide/gui/libide-gui.gresource.xml
index 616e09255..808da345c 100644
--- a/src/libide/gui/libide-gui.gresource.xml
+++ b/src/libide/gui/libide-gui.gresource.xml
@@ -12,6 +12,7 @@
   </gresource>
   <gresource prefix="/org/gnome/libide-gui/ui">
     <file preprocess="xml-stripblanks">ide-environment-editor-row.ui</file>
+    <file preprocess="xml-stripblanks">ide-frame.ui</file>
     <file preprocess="xml-stripblanks">ide-header-bar.ui</file>
     <file preprocess="xml-stripblanks">ide-notification-list-box-row.ui</file>
     <file preprocess="xml-stripblanks">ide-notification-view.ui</file>