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by kksou
Sample Code 194: How to get color values from gtkcolorbutton? |
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Written by kksou
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Friday, 09 March 2007 |
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Problem You have set up a GtkColorButton/GtkColorSelection to allow user to select colors from a color palette. You would like to retrieve the selected color in RGB values as shown below:
Solution
- Set up a dialog with a GtkColorSelection in it.
- Use the signal color-changed to know when the user has selected a color.
- Get the selected color with GtkColorselection::get_current_color(). However, note that the value returned is a GdkColor.
- While gtk+ does have a method
Gtk::color_selection_palette_to_string()to convert GdkColor to RGB values, it doesn't seem to exist in php-gtk2. (Thanks to Johan du Toit for pointing this out. Please see reader's comments below.)
- If you want the selected color in RGB values, we can "dig" inside GtkColorSelection widget to get the RGB values direct from the GtkEntry.
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| <?php
$window = new GtkWindow();
$window->set_size_request(400, 120);
$window->connect_simple('destroy', array('Gtk','main_quit'));
$window->add($vbox = new GtkVBox());
// display title
$title = new GtkLabel("Get Color Values from GtkColorButton");
$title->modify_font(new PangoFontDescription("Times New Roman Italic 10"));
$title->modify_fg(Gtk::STATE_NORMAL, GdkColor::parse("#0000ff"));
$title->set_size_request(-1, 40);
$vbox->pack_start($title, 0, 0);
$vbox->pack_start(new GtkLabel(), 0, 0);
$hbox = new GtkHBox();
$vbox->pack_start($hbox, 0, 0);
$hbox->pack_start($button = new GtkButton('Select Color'), 0, 0);
$hbox->pack_start(new GtkLabel(' : '), 0);
$hbox->pack_start($color_button = new GtkButton(), 0, 0);
$color_button->set_size_request(40,20);
$hbox->pack_start(new GtkLabel(' '), 0);
$selected_color_entry = new GtkEntry();
$hbox->pack_start($selected_color_entry, 0);
$button->connect('clicked', 'on_click', $color_button, $selected_color_entry);
$color_button->connect('clicked', 'on_click', $color_button, $selected_color_entry);
$window->show_all();
Gtk::main();
function on_click($button, $color_button, $selected_color_entry) {
$color = select_color();
echo "color = $color\n";
if ($color=='') return;
$selected_color_entry->set_text($color); // note 4
$color_button->modify_bg(Gtk::STATE_NORMAL, GdkColor::parse($color));
$color_button->modify_bg(Gtk::STATE_PRELIGHT, GdkColor::parse($color));
$color_button->modify_bg(Gtk::STATE_ACTIVE, GdkColor::parse($color));
}
function select_color() {
$colorbutton = new ColorButton();
return $colorbutton->selected_color;
}
class ColorButton{
var $selected_color='';
function ColorButton() {
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- Note that this is only 70% of the sample code. You have to be a registered member to see the entire sample code. Please login or register.
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Explanation
- Create the GtkColorSelection.
- Register the signal
color-changed
- Get the selected color direct from the GtkColorSelection widget.
- Echo the selected color.
Related Links
User reviews Average user ratings:  0.0 (from 2 users) Note: You have to be a registered member to leave a comment. Free registration here. |
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March 08, 2007 5:42am
I do get the following error:
"PHP Fatal error: Call to undefined method Gtk::color_selection_palette_to_string() in D:\getcolor.phpw on line 28"
March 08, 2007 8:16pm
Thanks for pointing this out. My version of php-gtk2 does have this method, but I checked some of the other versions, and yes you're right, it is indeed not there.Have changed the example to use GtkColorSelection instead so that we can "dig" inside the GtkColorSelection to get the RGB values direct from the GtkEntry containing the RGB values.