shimmie2/ext/resize/theme.php

<?php

class ResizeImageTheme extends Themelet
{
    /*
     * Display a link to resize an image
     */
    public function get_resize_html(Image $image)
    {
        global $config;

        $default_width = $config->get_int('resize_default_width');
        $default_height = $config->get_int('resize_default_height');

        if (!$default_width) {
            $default_width = $image->width;
        }
        if (!$default_height) {
            $default_height = $image->height;
        }
        
        $html = "
			".make_form(make_link("resize/{$image->id}"), 'POST')."
				<input type='hidden' name='image_id' value='{$image->id}'>
				<input id='original_width'  name='original_width'  type='hidden' value='{$image->width}'>
				<input id='original_height' name='original_height' type='hidden' value='{$image->height}'>
				<input id='resize_width'  style='width: 70px;' name='resize_width'  type='number' min='1' value='".$default_width."'> x
				<input id='resize_height' style='width: 70px;' name='resize_height' type='number' min='1' value='".$default_height."'>
				<br><label><input type='checkbox' id='resize_aspect' name='resize_aspect' style='max-width: 20px;' checked='checked'> Keep Aspect</label>
				<br><input id='resizebutton' type='submit' value='Resize'>
			</form>
		";
        
        return $html;
    }
    
    public function display_resize_error(Page $page, string $title, string $message)
    {
        $page->set_title("Resize Image");
        $page->set_heading("Resize Image");
        $page->add_block(new NavBlock());
        $page->add_block(new Block($title, $message));
    }
}