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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.
- Registration is free and immediate.
- Have some doubt about the registration? Please read this forum article.
Explanation
- Create the GtkColorSelection.
- Register the signal
color-changed
- Get the selected color direct from the GtkColorSelection widget.
- Echo the selected color.
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