/**
 * Creates a visual theme for spinner field triggers.  Note this mixin only provides
 * styling for the spinner trigger buttons. The text field portion of the styling must be
 * created using {@link Ext.form.field.Text#css_mixin-extjs-text-field-ui}
 *
 * @param {string} $ui
 * The name of the UI being created. Can not included spaces or special punctuation
 * (used in CSS class names).
 *
 * @param {boolean} [$ui-trigger-vertical=$spinner-trigger-vertical]
 * `true` to align the up/down triggers vertically.
 *
 * @param {number} [$ui-trigger-width=$form-trigger-width]
 * The width of the triggers.
 *
 * @param {number} [$ui-field-height=$form-text-field-height]
 * The height of the text field that the trigger must fit within.  This does not set the
 * height of the field, only the height of the triggers.  When {@link #css_mixin-extjs-spinner-trigger-ui $ui-trigger-vertical}
 * is true, the available height within the field borders is divided evenly between the
 * two triggers.
 *
 * @param {number/list} [$ui-field-border-width=$form-text-field-border-width]
 * The border width of the text field that the trigger must fit within.  This does not set
 * the border of the field, it is only needed so that the border-width of the field can
 * be subtracted from the trigger height.
 *
 * @param {string} [$ui-trigger-vertical-background-image=$spinner-trigger-vertical-background-image]
 * The background image sprite for vertically aligned spinner triggers
 *
 * @param {string} [$ui-trigger-up-background-image='form/spinner-up']
 * The background image for the "up" trigger when triggers are horizontally aligned
 *
 * @param {string} [$ui-trigger-down-background-image='form/spinner-down']
 * The background image for the "down" trigger when triggers are horizontally aligned
 *
 * @param {string/list} [$ui-trigger-up-glyph=$spinner-trigger-up-glyph]
 * The glyph for the "up" spinner trigger trigger when {@link Global_CSS#$enable-font-icons} is `true`.
 *
 * @param {string/list} [$ui-trigger-down-glyph=$spinner-trigger-down-glyph]
 * The glyph for the "down" spinner trigger trigger when {@link Global_CSS#$enable-font-icons} is `true`.
 *
 * @param {color} [$ui-trigger-glyph-color=$spinner-trigger-glyph-color]
 * The color of spinner triggers when {@link Global_CSS#$enable-font-icons} is `true`.
 *
 * @param {color} [$ui-trigger-background-color=$form-text-field-background-color]
 * The background color of the spinner triggers
 *
 * @param {boolean} [$ui-classic-border=$form-text-field-classic-border]
 * `true` to use classic-theme styled border.
 *
 * @member Ext.form.trigger.Spinner
 */
@mixin extjs-spinner-trigger-ui(
    $ui: null,
    $ui-trigger-vertical: $spinner-trigger-vertical,
    $ui-trigger-width: $form-trigger-width,
    $ui-field-height: $form-text-field-height,
    $ui-field-border-width: $form-text-field-border-width,
    $ui-trigger-vertical-background-image: $spinner-trigger-vertical-background-image,
    $ui-trigger-up-background-image: $spinner-trigger-up-background-image,
    $ui-trigger-down-background-image: $spinner-trigger-down-background-image,
    $ui-trigger-up-glyph: $spinner-trigger-up-glyph,
    $ui-trigger-down-glyph: $spinner-trigger-down-glyph,
    $ui-trigger-glyph-color: $spinner-trigger-glyph-color,
    $ui-trigger-background-color: $form-text-field-background-color,
    $ui-classic-border: $form-text-field-classic-border 
){
    $ui-inner-height: if($ui-classic-border, $ui-field-height, $ui-field-height - vertical($ui-field-border-width));
    $ui-trigger-height: if($ui-trigger-vertical, $ui-inner-height / 2, $ui-inner-height);
 
    .#{$prefix}form-trigger-spinner-#{$ui} {
        width: if($ui-trigger-vertical, $ui-trigger-width, $ui-trigger-width * 2);
        @if $ui-classic-border {
            border: 0;
        }
 
        @if $enable-font-icons and ($ui-trigger-up-glyph != null or $ui-trigger-down-glyph != null) {
            // remove pseduo element from default trigger 
            &:before {
                content: '';
            }
        }
    }
 
    .#{$prefix}form-spinner-#{$ui} {
        @if $ui-trigger-vertical {
            @if (not $enable-font-icons) or ($ui-trigger-up-glyph == null and $ui-trigger-down-glyph == null) {
                background-image: theme-background-image($ui-trigger-vertical-background-image);
                @if $include-rtl {
                    &.#{$prefix}rtl {
                        background-image: theme-background-image($ui-trigger-vertical-background-image + '-rtl');
                    }
                }
            }
        } @else {
            display: inline-block;
        }
        background-color: $ui-trigger-background-color;
        width: $ui-trigger-width;
        height: $ui-trigger-height;
        @if $enable-font-icons {
            color: $ui-trigger-glyph-color;
        }
    }
 
    @if not $spinner-trigger-vertical {
        @if (not $enable-font-icons) or ($ui-trigger-up-glyph == null) {
            .#{$prefix}form-spinner-up-#{$ui} {
                background-image: theme-background-image($ui-trigger-up-background-image);
                @if $include-rtl {
                    &.#{$prefix}rtl {
                        background-image: theme-background-image($ui-trigger-up-background-image + '-rtl');
                    }
                }
            }
        }
 
        @if (not $enable-font-icons) or ($ui-trigger-down-glyph == null) {
            .#{$prefix}form-spinner-down-#{$ui} {
                background-image: theme-background-image($ui-trigger-down-background-image);
                @if $include-rtl {
                    &.#{$prefix}rtl {
                        background-image: theme-background-image($ui-trigger-down-background-image + '-rtl');
                    }
                }
            }
        }
    }
 
    @if $enable-font-icons and ($ui-trigger-up-glyph != null) {
        .#{$prefix}form-spinner-up-#{$ui} {
            @include font-icon($ui-trigger-up-glyph);
        }
    }
 
    @if $enable-font-icons and ($ui-trigger-down-glyph != null) {
        .#{$prefix}form-spinner-down-#{$ui} {
            @include font-icon($ui-trigger-down-glyph);
        }
    }
 
    @if $ui-trigger-vertical {
        .#{$prefix}form-spinner-up-#{$ui} {
            background-position: 0 0;
 
            &.#{$prefix}form-spinner-over {
                background-position: (-$ui-trigger-width) 0;
                &.#{$prefix}form-spinner-focus {
                    background-position: -($ui-trigger-width * 4) 0;
                }
            }
 
            &.#{$prefix}form-spinner-focus {
                background-position: -($ui-trigger-width * 3) 0;
            }
 
            // add x-form-spinner class to increase specificity of "click" above focus/over 
            &.#{$prefix}form-spinner.#{$prefix}form-spinner-click {
                background-position: -($ui-trigger-width * 2) 0;
            }
        }
 
        .#{$prefix}form-spinner-down-#{$ui} {
            background-position: 0 (-$ui-trigger-height);
 
            &.#{$prefix}form-spinner-over {
                background-position: (-$ui-trigger-width) (-$ui-trigger-height);
                &.#{$prefix}form-spinner-focus {
                    background-position: -($ui-trigger-width * 4) (-$ui-trigger-height);
                }
            }
 
            &.#{$prefix}form-spinner-focus {
                background-position: -($ui-trigger-width * 3) (-$ui-trigger-height);
            }
 
            // add x-form-spinner class to increase specificity of "click" above focus/over 
            &.#{$prefix}form-spinner.#{$prefix}form-spinner-click {
                background-position: -($ui-trigger-width * 2) (-$ui-trigger-height);
            }
        }
    } @else {
        .#{$prefix}form-spinner-#{$ui} {
            background-position: 0 0;
 
            &.#{$prefix}form-spinner-over {
                background-position: (-$ui-trigger-width) 0;
                &.#{$prefix}form-spinner-focus {
                    background-position: -($ui-trigger-width * 4) 0;
                }
            }
 
            &.#{$prefix}form-spinner-focus {
                background-position: -($ui-trigger-width * 3) 0;
            }
 
            // add x-form-spinner class to increase specificity of "click" above focus/over 
            &.#{$prefix}form-spinner.#{$prefix}form-spinner-click {
                background-position: -($ui-trigger-width * 2) 0;
            }
        }
    }
}