root / drupal7 / modules / image / image.api.php @ 76597ebf
| 1 | 85ad3d82 | Assos Assos | <?php
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| 2 | |||
| 3 | /**
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| 4 | * @file
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| 5 | * Hooks related to image styles and effects.
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| 6 | */
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| 7 | |||
| 8 | /**
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| 9 | * @addtogroup hooks
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| 10 | * @{
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| 11 | */
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| 12 | |||
| 13 | /**
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| 14 | * Define information about image effects provided by a module.
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| 15 | *
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| 16 | * This hook enables modules to define image manipulation effects for use with
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| 17 | * an image style.
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| 18 | *
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| 19 | * @return
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| 20 | * An array of image effects. This array is keyed on the machine-readable
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| 21 | * effect name. Each effect is defined as an associative array containing the
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| 22 | * following items:
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| 23 | * - "label": The human-readable name of the effect.
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| 24 | * - "effect callback": The function to call to perform this image effect.
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| 25 | * - "dimensions passthrough": (optional) Set this item if the effect doesn't
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| 26 | * change the dimensions of the image.
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| 27 | * - "dimensions callback": (optional) The function to call to transform
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| 28 | * dimensions for this effect.
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| 29 | * - "help": (optional) A brief description of the effect that will be shown
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| 30 | * when adding or configuring this image effect.
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| 31 | * - "form callback": (optional) The name of a function that will return a
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| 32 | * $form array providing a configuration form for this image effect.
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| 33 | * - "summary theme": (optional) The name of a theme function that will output
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| 34 | * a summary of this image effect's configuration.
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| 35 | *
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| 36 | * @see hook_image_effect_info_alter()
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| 37 | */
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| 38 | function hook_image_effect_info() { |
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| 39 | $effects = array(); |
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| 40 | |||
| 41 | $effects['mymodule_resize'] = array( |
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| 42 | 'label' => t('Resize'), |
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| 43 | 'help' => t('Resize an image to an exact set of dimensions, ignoring aspect ratio.'), |
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| 44 | 'effect callback' => 'mymodule_resize_effect', |
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| 45 | 'dimensions callback' => 'mymodule_resize_dimensions', |
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| 46 | 'form callback' => 'mymodule_resize_form', |
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| 47 | 'summary theme' => 'mymodule_resize_summary', |
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| 48 | ); |
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| 49 | |||
| 50 | return $effects; |
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| 51 | } |
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| 52 | |||
| 53 | /**
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| 54 | * Alter the information provided in hook_image_effect_info().
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| 55 | *
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| 56 | * @param $effects
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| 57 | * The array of image effects, keyed on the machine-readable effect name.
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| 58 | *
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| 59 | * @see hook_image_effect_info()
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| 60 | */
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| 61 | function hook_image_effect_info_alter(&$effects) { |
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| 62 | // Override the Image module's crop effect with more options.
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| 63 | $effects['image_crop']['effect callback'] = 'mymodule_crop_effect'; |
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| 64 | $effects['image_crop']['dimensions callback'] = 'mymodule_crop_dimensions'; |
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| 65 | $effects['image_crop']['form callback'] = 'mymodule_crop_form'; |
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| 66 | } |
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| 67 | |||
| 68 | /**
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| 69 | * Respond to image style updating.
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| 70 | *
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| 71 | * This hook enables modules to update settings that might be affected by
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| 72 | * changes to an image. For example, updating a module specific variable to
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| 73 | * reflect a change in the image style's name.
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| 74 | *
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| 75 | * @param $style
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| 76 | * The image style array that is being updated.
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| 77 | */
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| 78 | function hook_image_style_save($style) { |
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| 79 | // If a module defines an image style and that style is renamed by the user
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| 80 | // the module should update any references to that style.
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| 81 | if (isset($style['old_name']) && $style['old_name'] == variable_get('mymodule_image_style', '')) { |
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| 82 | variable_set('mymodule_image_style', $style['name']); |
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| 83 | } |
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| 84 | } |
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| 85 | |||
| 86 | /**
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| 87 | * Respond to image style deletion.
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| 88 | *
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| 89 | * This hook enables modules to update settings when a image style is being
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| 90 | * deleted. If a style is deleted, a replacement name may be specified in
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| 91 | * $style['name'] and the style being deleted will be specified in
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| 92 | * $style['old_name'].
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| 93 | *
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| 94 | * @param $style
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| 95 | * The image style array that being deleted.
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| 96 | */
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| 97 | function hook_image_style_delete($style) { |
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| 98 | // Administrators can choose an optional replacement style when deleting.
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| 99 | // Update the modules style variable accordingly.
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| 100 | if (isset($style['old_name']) && $style['old_name'] == variable_get('mymodule_image_style', '')) { |
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| 101 | variable_set('mymodule_image_style', $style['name']); |
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| 102 | } |
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| 103 | } |
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| 104 | |||
| 105 | /**
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| 106 | * Respond to image style flushing.
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| 107 | *
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| 108 | * This hook enables modules to take effect when a style is being flushed (all
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| 109 | * images are being deleted from the server and regenerated). Any
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| 110 | * module-specific caches that contain information related to the style should
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| 111 | * be cleared using this hook. This hook is called whenever a style is updated,
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| 112 | * deleted, or any effect associated with the style is update or deleted.
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| 113 | *
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| 114 | * @param $style
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| 115 | * The image style array that is being flushed.
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| 116 | */
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| 117 | function hook_image_style_flush($style) { |
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| 118 | // Empty cached data that contains information about the style.
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| 119 | cache_clear_all('*', 'cache_mymodule', TRUE); |
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| 120 | } |
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| 121 | |||
| 122 | /**
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| 123 | * Modify any image styles provided by other modules or the user.
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| 124 | *
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| 125 | * This hook allows modules to modify, add, or remove image styles. This may
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| 126 | * be useful to modify default styles provided by other modules or enforce
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| 127 | * that a specific effect is always enabled on a style. Note that modifications
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| 128 | * to these styles may negatively affect the user experience, such as if an
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| 129 | * effect is added to a style through this hook, the user may attempt to remove
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| 130 | * the effect but it will be immediately be re-added.
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| 131 | *
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| 132 | * The best use of this hook is usually to modify default styles, which are not
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| 133 | * editable by the user until they are overridden, so such interface
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| 134 | * contradictions will not occur. This hook can target default (or user) styles
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| 135 | * by checking the $style['storage'] property.
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| 136 | *
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| 137 | * If your module needs to provide a new style (rather than modify an existing
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| 138 | * one) use hook_image_default_styles() instead.
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| 139 | *
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| 140 | * @see hook_image_default_styles()
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| 141 | */
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| 142 | function hook_image_styles_alter(&$styles) { |
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| 143 | // Check that we only affect a default style.
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| 144 | if ($styles['thumbnail']['storage'] == IMAGE_STORAGE_DEFAULT) { |
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| 145 | // Add an additional effect to the thumbnail style.
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| 146 | $styles['thumbnail']['effects'][] = array( |
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| 147 | 'name' => 'image_desaturate', |
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| 148 | 'data' => array(), |
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| 149 | 'weight' => 1, |
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| 150 | 'effect callback' => 'image_desaturate_effect', |
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| 151 | ); |
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| 152 | } |
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| 153 | } |
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| 154 | |||
| 155 | /**
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| 156 | * Provide module-based image styles for reuse throughout Drupal.
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| 157 | *
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| 158 | * This hook allows your module to provide image styles. This may be useful if
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| 159 | * you require images to fit within exact dimensions. Note that you should
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| 160 | * attempt to re-use the default styles provided by Image module whenever
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| 161 | * possible, rather than creating image styles that are specific to your module.
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| 162 | * Image provides the styles "thumbnail", "medium", and "large".
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| 163 | *
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| 164 | * You may use this hook to more easily manage your site's changes by moving
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| 165 | * existing image styles from the database to a custom module. Note however that
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| 166 | * moving image styles to code instead storing them in the database has a
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| 167 | * negligible effect on performance, since custom image styles are loaded
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| 168 | * from the database all at once. Even if all styles are pulled from modules,
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| 169 | * Image module will still perform the same queries to check the database for
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| 170 | * any custom styles.
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| 171 | *
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| 172 | * @return
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| 173 | * An array of image styles, keyed by the style name.
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| 174 | * @see image_image_default_styles()
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| 175 | */
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| 176 | function hook_image_default_styles() { |
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| 177 | $styles = array(); |
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| 178 | |||
| 179 | $styles['mymodule_preview'] = array( |
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| 180 | 'label' => 'My module preview', |
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| 181 | 'effects' => array( |
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| 182 | array(
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| 183 | 'name' => 'image_scale', |
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| 184 | 'data' => array('width' => 400, 'height' => 400, 'upscale' => 1), |
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| 185 | 'weight' => 0, |
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| 186 | ), |
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| 187 | array(
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| 188 | 'name' => 'image_desaturate', |
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| 189 | 'data' => array(), |
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| 190 | 'weight' => 1, |
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| 191 | ), |
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| 192 | ), |
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| 193 | ); |
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| 194 | |||
| 195 | return $styles; |
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| 196 | } |
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| 197 | |||
| 198 | /**
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| 199 | * @} End of "addtogroup hooks".
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| 200 | */ |