[gtk+] demo: add a demo for blend modes
- From: Matthias Clasen <matthiasc src gnome org>
- To: commits-list gnome org
- Cc:
- Subject: [gtk+] demo: add a demo for blend modes
- Date: Sun, 3 Jul 2016 21:47:21 +0000 (UTC)
commit 1d93cc2b0b88bcc02f8a15d80b8a75d61d0cb24a
Author: Georges Basile Stavracas Neto <georges stavracas gmail com>
Date: Fri Jul 1 19:39:04 2016 -0300
demo: add a demo for blend modes
After introducing the CSS blend mode enum values and including
the background-blend-mode CSS property, it is very important to
actually provide an example of the new feature.
This patch adds a new demo to gtk3-demo which shows how the
background-blend-mode CSS property works.
https://bugzilla.gnome.org/show_bug.cgi?id=768305
demos/gtk-demo/Makefile.am | 1 +
demos/gtk-demo/blendmodes.ui | 391 +++++++++++++++++++++++++++++++++++++
demos/gtk-demo/blends.png | Bin 0 -> 788 bytes
demos/gtk-demo/cmy.jpg | Bin 0 -> 55825 bytes
demos/gtk-demo/css_blendmodes.c | 178 +++++++++++++++++
demos/gtk-demo/css_blendmodes.css | 51 +++++
demos/gtk-demo/demo.gresource.xml | 8 +
demos/gtk-demo/ducky.png | Bin 0 -> 248546 bytes
8 files changed, 629 insertions(+), 0 deletions(-)
---
diff --git a/demos/gtk-demo/Makefile.am b/demos/gtk-demo/Makefile.am
index 80927d0..8c15e16 100644
--- a/demos/gtk-demo/Makefile.am
+++ b/demos/gtk-demo/Makefile.am
@@ -14,6 +14,7 @@ demos_base = \
combobox.c \
css_accordion.c \
css_basics.c \
+ css_blendmodes.c \
css_multiplebgs.c \
css_pixbufs.c \
css_shadows.c \
diff --git a/demos/gtk-demo/blendmodes.ui b/demos/gtk-demo/blendmodes.ui
new file mode 100644
index 0000000..9badf33
--- /dev/null
+++ b/demos/gtk-demo/blendmodes.ui
@@ -0,0 +1,391 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<interface>
+ <requires lib="gtk+" version="3.20"/>
+ <object class="GtkWindow" id="window">
+ <property name="can_focus">False</property>
+ <property name="title">CSS Blend Modes</property>
+ <property name="default_width">400</property>
+ <property name="default_height">300</property>
+ <child>
+ <object class="GtkGrid">
+ <property name="visible">True</property>
+ <property name="can_focus">False</property>
+ <property name="border_width">12</property>
+ <property name="row_spacing">12</property>
+ <property name="column_spacing">12</property>
+ <child>
+ <object class="GtkLabel">
+ <property name="visible">True</property>
+ <property name="can_focus">False</property>
+ <property name="label" translatable="yes">Blend mode:</property>
+ <property name="xalign">0</property>
+ <style>
+ <class name="dim-label"/>
+ </style>
+ </object>
+ <packing>
+ <property name="left_attach">0</property>
+ <property name="top_attach">0</property>
+ </packing>
+ </child>
+ <child>
+ <object class="GtkScrolledWindow" id="scrolledwindow">
+ <property name="visible">True</property>
+ <property name="can_focus">True</property>
+ <property name="vexpand">True</property>
+ <property name="shadow_type">in</property>
+ <property name="min_content_width">150</property>
+ </object>
+ <packing>
+ <property name="left_attach">0</property>
+ <property name="top_attach">1</property>
+ </packing>
+ </child>
+ <child>
+ <object class="GtkStackSwitcher">
+ <property name="visible">True</property>
+ <property name="can_focus">False</property>
+ <property name="halign">center</property>
+ <property name="hexpand">True</property>
+ <property name="stack">stack</property>
+ </object>
+ <packing>
+ <property name="left_attach">1</property>
+ <property name="top_attach">0</property>
+ </packing>
+ </child>
+ <child>
+ <object class="GtkStack" id="stack">
+ <property name="visible">True</property>
+ <property name="can_focus">False</property>
+ <property name="hexpand">True</property>
+ <property name="vexpand">True</property>
+ <property name="hhomogeneous">False</property>
+ <property name="vhomogeneous">False</property>
+ <property name="transition_type">crossfade</property>
+ <child>
+ <object class="GtkGrid">
+ <property name="visible">True</property>
+ <property name="can_focus">False</property>
+ <property name="halign">center</property>
+ <property name="valign">center</property>
+ <property name="hexpand">False</property>
+ <property name="vexpand">True</property>
+ <property name="row_spacing">12</property>
+ <property name="column_spacing">12</property>
+ <child>
+ <object class="GtkLabel">
+ <property name="visible">True</property>
+ <property name="can_focus">False</property>
+ <property name="label" translatable="yes">Duck</property>
+ </object>
+ <packing>
+ <property name="left_attach">0</property>
+ <property name="top_attach">0</property>
+ </packing>
+ </child>
+ <child>
+ <object class="GtkLabel">
+ <property name="visible">True</property>
+ <property name="can_focus">False</property>
+ <property name="label" translatable="yes">Background</property>
+ </object>
+ <packing>
+ <property name="left_attach">1</property>
+ <property name="top_attach">0</property>
+ </packing>
+ </child>
+ <child>
+ <object class="GtkImage">
+ <property name="visible">True</property>
+ <property name="can_focus">False</property>
+ <style>
+ <class name="duck"/>
+ </style>
+ </object>
+ <packing>
+ <property name="left_attach">0</property>
+ <property name="top_attach">1</property>
+ </packing>
+ </child>
+ <child>
+ <object class="GtkImage">
+ <property name="visible">True</property>
+ <property name="can_focus">False</property>
+ <style>
+ <class name="gradient"/>
+ </style>
+ </object>
+ <packing>
+ <property name="left_attach">1</property>
+ <property name="top_attach">1</property>
+ </packing>
+ </child>
+ <child>
+ <object class="GtkLabel">
+ <property name="visible">True</property>
+ <property name="can_focus">False</property>
+ <property name="label" translatable="yes">
+Blended picture</property>
+ </object>
+ <packing>
+ <property name="left_attach">0</property>
+ <property name="top_attach">2</property>
+ <property name="width">2</property>
+ </packing>
+ </child>
+ <child>
+ <object class="GtkImage">
+ <property name="visible">True</property>
+ <property name="can_focus">False</property>
+ <property name="halign">center</property>
+ <style>
+ <class name="blend0"/>
+ </style>
+ </object>
+ <packing>
+ <property name="left_attach">0</property>
+ <property name="top_attach">3</property>
+ <property name="width">2</property>
+ </packing>
+ </child>
+ </object>
+ <packing>
+ <property name="name">page0</property>
+ <property name="title" translatable="yes">Ducky</property>
+ </packing>
+ </child>
+ <child>
+ <object class="GtkGrid">
+ <property name="visible">True</property>
+ <property name="can_focus">False</property>
+ <property name="halign">center</property>
+ <property name="valign">center</property>
+ <property name="hexpand">False</property>
+ <property name="vexpand">True</property>
+ <property name="row_spacing">12</property>
+ <property name="column_spacing">12</property>
+ <child>
+ <object class="GtkLabel">
+ <property name="visible">True</property>
+ <property name="can_focus">False</property>
+ <property name="label" translatable="yes">Red</property>
+ </object>
+ <packing>
+ <property name="left_attach">0</property>
+ <property name="top_attach">0</property>
+ </packing>
+ </child>
+ <child>
+ <object class="GtkLabel">
+ <property name="visible">True</property>
+ <property name="can_focus">False</property>
+ <property name="label" translatable="yes">Blue</property>
+ </object>
+ <packing>
+ <property name="left_attach">1</property>
+ <property name="top_attach">0</property>
+ </packing>
+ </child>
+ <child>
+ <object class="GtkImage">
+ <property name="visible">True</property>
+ <property name="can_focus">False</property>
+ <style>
+ <class name="red"/>
+ </style>
+ </object>
+ <packing>
+ <property name="left_attach">0</property>
+ <property name="top_attach">1</property>
+ </packing>
+ </child>
+ <child>
+ <object class="GtkImage">
+ <property name="visible">True</property>
+ <property name="can_focus">False</property>
+ <style>
+ <class name="blue"/>
+ </style>
+ </object>
+ <packing>
+ <property name="left_attach">1</property>
+ <property name="top_attach">1</property>
+ </packing>
+ </child>
+ <child>
+ <object class="GtkLabel">
+ <property name="visible">True</property>
+ <property name="can_focus">False</property>
+ <property name="label" translatable="yes">
+Blended picture</property>
+ </object>
+ <packing>
+ <property name="left_attach">0</property>
+ <property name="top_attach">2</property>
+ <property name="width">2</property>
+ </packing>
+ </child>
+ <child>
+ <object class="GtkImage">
+ <property name="visible">True</property>
+ <property name="can_focus">False</property>
+ <property name="halign">center</property>
+ <style>
+ <class name="blend1"/>
+ </style>
+ </object>
+ <packing>
+ <property name="left_attach">0</property>
+ <property name="top_attach">3</property>
+ <property name="width">2</property>
+ </packing>
+ </child>
+ </object>
+ <packing>
+ <property name="name">page1</property>
+ <property name="title" translatable="yes">Blends</property>
+ </packing>
+ </child>
+ <child>
+ <object class="GtkGrid">
+ <property name="visible">True</property>
+ <property name="can_focus">False</property>
+ <property name="halign">center</property>
+ <property name="valign">center</property>
+ <property name="hexpand">True</property>
+ <property name="vexpand">True</property>
+ <property name="row_spacing">6</property>
+ <property name="column_spacing">12</property>
+ <child>
+ <object class="GtkImage">
+ <property name="visible">True</property>
+ <property name="can_focus">False</property>
+ <style>
+ <class name="cyan"/>
+ </style>
+ </object>
+ <packing>
+ <property name="left_attach">0</property>
+ <property name="top_attach">1</property>
+ </packing>
+ </child>
+ <child>
+ <object class="GtkImage">
+ <property name="visible">True</property>
+ <property name="can_focus">False</property>
+ <style>
+ <class name="magenta"/>
+ </style>
+ </object>
+ <packing>
+ <property name="left_attach">1</property>
+ <property name="top_attach">1</property>
+ </packing>
+ </child>
+ <child>
+ <object class="GtkImage">
+ <property name="visible">True</property>
+ <property name="can_focus">False</property>
+ <style>
+ <class name="yellow"/>
+ </style>
+ </object>
+ <packing>
+ <property name="left_attach">0</property>
+ <property name="top_attach">3</property>
+ </packing>
+ </child>
+ <child>
+ <object class="GtkImage">
+ <property name="visible">True</property>
+ <property name="can_focus">False</property>
+ <property name="halign">center</property>
+ <style>
+ <class name="blend2"/>
+ </style>
+ </object>
+ <packing>
+ <property name="left_attach">1</property>
+ <property name="top_attach">3</property>
+ </packing>
+ </child>
+ <child>
+ <object class="GtkLabel">
+ <property name="visible">True</property>
+ <property name="can_focus">False</property>
+ <property name="label" translatable="yes">Cyan</property>
+ <property name="xalign">0</property>
+ <style>
+ <class name="dim-label"/>
+ </style>
+ </object>
+ <packing>
+ <property name="left_attach">0</property>
+ <property name="top_attach">0</property>
+ </packing>
+ </child>
+ <child>
+ <object class="GtkLabel">
+ <property name="visible">True</property>
+ <property name="can_focus">False</property>
+ <property name="label" translatable="yes">Magenta</property>
+ <property name="xalign">0</property>
+ <style>
+ <class name="dim-label"/>
+ </style>
+ </object>
+ <packing>
+ <property name="left_attach">1</property>
+ <property name="top_attach">0</property>
+ </packing>
+ </child>
+ <child>
+ <object class="GtkLabel">
+ <property name="visible">True</property>
+ <property name="can_focus">False</property>
+ <property name="label" translatable="yes">Yellow</property>
+ <property name="xalign">0</property>
+ <style>
+ <class name="dim-label"/>
+ </style>
+ </object>
+ <packing>
+ <property name="left_attach">0</property>
+ <property name="top_attach">2</property>
+ </packing>
+ </child>
+ <child>
+ <object class="GtkLabel">
+ <property name="visible">True</property>
+ <property name="can_focus">False</property>
+ <property name="label" translatable="yes">Blended picture</property>
+ <property name="xalign">0</property>
+ <attributes>
+ <attribute name="weight" value="bold"/>
+ </attributes>
+ </object>
+ <packing>
+ <property name="left_attach">1</property>
+ <property name="top_attach">2</property>
+ </packing>
+ </child>
+ </object>
+ <packing>
+ <property name="name">page2</property>
+ <property name="title" translatable="yes">CMYK</property>
+ </packing>
+ </child>
+ </object>
+ <packing>
+ <property name="left_attach">1</property>
+ <property name="top_attach">1</property>
+ </packing>
+ </child>
+ </object>
+ </child>
+ <child type="titlebar">
+ <placeholder/>
+ </child>
+ </object>
+</interface>
diff --git a/demos/gtk-demo/blends.png b/demos/gtk-demo/blends.png
new file mode 100644
index 0000000..afc6c4a
Binary files /dev/null and b/demos/gtk-demo/blends.png differ
diff --git a/demos/gtk-demo/cmy.jpg b/demos/gtk-demo/cmy.jpg
new file mode 100644
index 0000000..f44d096
Binary files /dev/null and b/demos/gtk-demo/cmy.jpg differ
diff --git a/demos/gtk-demo/css_blendmodes.c b/demos/gtk-demo/css_blendmodes.c
new file mode 100644
index 0000000..4c4e673
--- /dev/null
+++ b/demos/gtk-demo/css_blendmodes.c
@@ -0,0 +1,178 @@
+/* Theming/CSS Blend Modes
+ *
+ * You can blend multiple backgrounds using the CSS blend modes available.
+ */
+
+#include <gtk/gtk.h>
+
+#define WID(x) ((GtkWidget*) gtk_builder_get_object (builder, x))
+
+/*
+ * These are the available blend modes.
+ */
+struct {
+ gchar *name;
+ gchar *id;
+} blend_modes[] =
+{
+ { "Color", "color" },
+ { "Color (burn)", "color-burn" },
+ { "Color (dodge)", "color-dodge" },
+ { "Darken", "darken" },
+ { "Difference", "difference" },
+ { "Exclusion", "exclusion" },
+ { "Hard Light", "hard-light" },
+ { "Hue", "hue" },
+ { "Lighten", "lighten" },
+ { "Luminosity", "luminosity" },
+ { "Multiply", "multiply" },
+ { "Normal", "normal" },
+ { "Overlay", "overlay" },
+ { "Saturate", "saturate" },
+ { "Screen", "screen" },
+ { "Soft Light", "soft-light" },
+ { NULL }
+};
+
+/*
+ * The CSS class to be applied in the blended image. Notice that the first %s
+ * is replaced by the content of css_blendmodes.css and the second %s is
+ * replaced by the blend mode.
+ */
+static const gchar *CSS_TEMPLATE =
+"%s\n"
+"\n"
+"image.blend0 {\n"
+" background-image: url('resource://css_blendmodes/ducky.png'),\n"
+" linear-gradient(to right, red 0%, green 50%, blue 100%);\n"
+" background-size: cover;\n"
+" background-blend-mode: %s;\n"
+" min-width: 200px;\n"
+" min-height: 200px;\n"
+"}\n"
+"\n"
+"image.blend1 {\n"
+" background: url('resource://css_blendmodes/blends.png') top center,\n"
+" url('resource://css_blendmodes/blends.png') bottom center;\n"
+" background-blend-mode: %s;\n"
+" min-width: 200px;\n"
+" min-height: 200px;\n"
+"}\n"
+"\n"
+"image.blend2 {\n"
+" background: url('resource://css_blendmodes/cmy.jpg') top center,\n"
+" url('resource://css_blendmodes/cmy.jpg') center center,\n"
+" url('resource://css_blendmodes/cmy.jpg') bottom center;\n"
+" background-blend-mode: %s;\n"
+" min-width: 200px;\n"
+" min-height: 200px;\n"
+"}\n";
+
+static void
+update_css_for_blend_mode (GtkCssProvider *provider,
+ const gchar *blend_mode)
+{
+ GBytes *bytes;
+ gchar *css;
+
+ bytes = g_resources_lookup_data ("/css_blendmodes/css_blendmodes.css", 0, NULL);
+
+ css = g_strdup_printf (CSS_TEMPLATE,
+ (gchar*) g_bytes_get_data (bytes, NULL),
+ blend_mode,
+ blend_mode,
+ blend_mode);
+
+ gtk_css_provider_load_from_data (provider, css, -1, NULL);
+
+ g_bytes_unref (bytes);
+ g_free (css);
+}
+
+static void
+row_activated (GtkListBox *listbox,
+ GtkListBoxRow *row,
+ GtkCssProvider *provider)
+{
+ const gchar *blend_mode;
+
+ blend_mode = blend_modes[gtk_list_box_row_get_index (row)].id;
+
+ update_css_for_blend_mode (provider, blend_mode);
+}
+
+static void
+setup_listbox (GtkBuilder *builder,
+ GtkStyleProvider *provider)
+{
+ GtkWidget *normal_row;
+ GtkWidget *listbox;
+ gint i;
+
+ normal_row = NULL;
+ listbox = gtk_list_box_new ();
+ gtk_container_add (GTK_CONTAINER (WID ("scrolledwindow")), listbox);
+
+ g_signal_connect (listbox, "row-activated", G_CALLBACK (row_activated), provider);
+
+ /* Add a row for each blend mode available */
+ for (i = 0; blend_modes[i].name != NULL; i++)
+ {
+ GtkWidget *label;
+ GtkWidget *row;
+
+ row = gtk_list_box_row_new ();
+ label = g_object_new (GTK_TYPE_LABEL,
+ "label", blend_modes[i].name,
+ "xalign", 0.0,
+ NULL);
+
+ gtk_container_add (GTK_CONTAINER (row), label);
+
+ gtk_container_add (GTK_CONTAINER (listbox), row);
+
+ /* The first selected row is "normal" */
+ if (g_strcmp0 (blend_modes[i].id, "normal") == 0)
+ normal_row = row;
+ }
+
+ /* Select the "normal" row */
+ gtk_list_box_select_row (GTK_LIST_BOX (listbox), GTK_LIST_BOX_ROW (normal_row));
+ g_signal_emit_by_name (G_OBJECT (normal_row), "activate");
+
+ gtk_widget_grab_focus (normal_row);
+}
+
+GtkWidget *
+do_css_blendmodes (GtkWidget *do_widget)
+{
+ static GtkWidget *window = NULL;
+
+ if (!window)
+ {
+ GtkStyleProvider *provider;
+ GtkBuilder *builder;
+
+ builder = gtk_builder_new_from_resource ("/css_blendmodes/blendmodes.ui");
+
+ window = WID ("window");
+ gtk_window_set_transient_for (GTK_WINDOW (window), GTK_WINDOW (do_widget));
+ g_signal_connect (window, "destroy", G_CALLBACK (gtk_widget_destroyed), &window);
+
+ /* Setup the CSS provider for window */
+ provider = GTK_STYLE_PROVIDER (gtk_css_provider_new ());
+
+ gtk_style_context_add_provider_for_screen (gdk_screen_get_default (),
+ provider,
+ GTK_STYLE_PROVIDER_PRIORITY_APPLICATION);
+
+ setup_listbox (builder, provider);
+ }
+
+ if (!gtk_widget_get_visible (window))
+ gtk_widget_show_all (window);
+ else
+ gtk_widget_destroy (window);
+
+ return window;
+}
diff --git a/demos/gtk-demo/css_blendmodes.css b/demos/gtk-demo/css_blendmodes.css
new file mode 100644
index 0000000..b212e50
--- /dev/null
+++ b/demos/gtk-demo/css_blendmodes.css
@@ -0,0 +1,51 @@
+/*
+ * First page.
+ */
+image.duck {
+ background-image: url('resource://css_blendmodes/ducky.png');
+ background-size: cover;
+ min-width: 200px;
+ min-height: 200px;
+}
+
+image.gradient {
+ background-image: linear-gradient(to right, red 0%, green 50%, blue 100%);
+ min-width: 200px;
+ min-height: 200px;
+}
+
+/*
+ * Second page.
+ */
+image.red {
+ background: url('resource://css_blendmodes/blends.png') top center;
+ min-width: 200px;
+ min-height: 200px;
+}
+
+image.blue {
+ background: url('resource://css_blendmodes/blends.png') bottom center;
+ min-width: 200px;
+ min-height: 200px;
+}
+
+/*
+ * Third page.
+ */
+image.cyan {
+ background: url('resource://css_blendmodes/cmy.jpg') top center;
+ min-width: 200px;
+ min-height: 200px;
+}
+
+image.magenta {
+ background: url('resource://css_blendmodes/cmy.jpg') center center;
+ min-width: 200px;
+ min-height: 200px;
+}
+
+image.yellow {
+ background: url('resource://css_blendmodes/cmy.jpg') bottom center;
+ min-width: 200px;
+ min-height: 200px;
+}
diff --git a/demos/gtk-demo/demo.gresource.xml b/demos/gtk-demo/demo.gresource.xml
index 4b30c67..f0c7201 100644
--- a/demos/gtk-demo/demo.gresource.xml
+++ b/demos/gtk-demo/demo.gresource.xml
@@ -20,6 +20,13 @@
<file>css_basics.css</file>
<file>reset.css</file>
</gresource>
+ <gresource prefix="/css_blendmodes">
+ <file>css_blendmodes.css</file>
+ <file>blendmodes.ui</file>
+ <file>blends.png</file>
+ <file>ducky.png</file>
+ <file>cmy.jpg</file>
+ </gresource>
<gresource prefix="/css_multiplebgs">
<file>css_multiplebgs.css</file>
<file>brick.png</file>
@@ -130,6 +137,7 @@
<file>combobox.c</file>
<file>css_accordion.c</file>
<file>css_basics.c</file>
+ <file>css_blendmodes.c</file>
<file>css_multiplebgs.c</file>
<file>css_pixbufs.c</file>
<file>css_shadows.c</file>
diff --git a/demos/gtk-demo/ducky.png b/demos/gtk-demo/ducky.png
new file mode 100644
index 0000000..f1cbd35
Binary files /dev/null and b/demos/gtk-demo/ducky.png differ
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