node-red/editor/js/ui/common/panels.js

/**
 * Copyright JS Foundation and other contributors, http://js.foundation
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 **/


RED.panels = (function() {

    function createPanel(options) {
        var container = options.container || $("#"+options.id);
        var children = container.children();
        if (children.length !== 2) {
            throw new Error("Container must have exactly two children");
        }

        container.addClass("red-ui-panels");
        var separator = $('<div class="red-ui-panels-separator"></div>').insertAfter(children[0]);
        var startPosition;
        var panelHeights = [];
        var modifiedHeights = false;
        var panelRatio;

        separator.draggable({
                axis: "y",
                containment: container,
                scroll: false,
                start:function(event,ui) {
                    var height = container.height();
                    startPosition = ui.position.top;
                    panelHeights = [$(children[0]).height(),$(children[1]).height()];
                },
                drag: function(event,ui) {
                    var height = container.height();
                    var delta = ui.position.top-startPosition;
                    var newHeights = [panelHeights[0]+delta,panelHeights[1]-delta];
                    $(children[0]).height(newHeights[0]);
                    $(children[1]).height(newHeights[1]);
                    if (options.resize) {
                        options.resize(newHeights[0],newHeights[1]);
                    }
                    ui.position.top -= delta;
                    panelRatio = newHeights[0]/height;
                },
                stop:function(event,ui) {
                    modifiedHeights = true;
                }
        });

        return {
            resize: function(height) {
                var panelHeights = [$(children[0]).height(),$(children[1]).height()];
                container.height(height);
                if (modifiedHeights) {
                    var topPanelHeight = panelRatio*height;
                    var bottomPanelHeight = height - topPanelHeight - 48;
                    panelHeights = [topPanelHeight,bottomPanelHeight];
                    $(children[0]).height(panelHeights[0]);
                    $(children[1]).height(panelHeights[1]);
                }
                if (options.resize) {
                    options.resize(panelHeights[0],panelHeights[1]);
                }
            }
        }
    }

    return {
        create: createPanel
    }
})();