Always create a default minmax w/l preset.

Add fill it at first use. Fixes the presets order on which preset change
tools depend.

src/app/application.js

@@ -1269,8 +1269,6 @@ dwv.App = function ()
         // get the view from the loaded data
         view = data.view;
         viewController = new dwv.ViewController(view);
-        // add the min/max preset (just the first time)
-        view.addWindowLevelMinMax();
 
         // append the DICOM tags table
         if ( tagsGui ) {

src/image/view.js

@@ -168,10 +168,11 @@ dwv.image.View = function (image)
 
     /**
      * Window presets.
+     * Minmax will be filled at first use (see view.setWindowLevelPreset).
      * @private
      * @type Object
      */
-    var windowPresets = [];
+    var windowPresets = { "minmax": {"name": "minmax"} };
 
     /**
      * Current window preset name.
@@ -464,6 +465,10 @@ dwv.image.View = function (image)
         if ( typeof preset === "undefined" ) {
             throw new Error("Unknown window level preset: '" + name + "'");
         }
+        // special min/max
+        if (name === "minmax" && typeof preset.wl === "undefined") {
+            preset.wl = this.getWindowLevelMinMax();
+        }
         // update member preset name
         currentPresetName = name;
         // special 'perslice' case
@@ -541,16 +546,6 @@ dwv.image.View.prototype.setWindowLevelMinMax = function()
     this.setWindowLevel(wl.getCenter(), wl.getWidth());
 };
 
-/**
- * Add the image min/max window/level to the list of presets.
- */
-dwv.image.View.prototype.addWindowLevelMinMax = function ()
-{
-    this.addWindowPresets( { "minmax": {
-        "wl": this.getWindowLevelMinMax(),
-        "name": "minmax" } } );
-};
-
 /**
  * Generate display image data to be given to a canvas.
  * @param {Array} array The array to fill in.
@@ -774,6 +769,12 @@ dwv.image.ViewFactory.prototype.create = function (dicomElements, image)
         }
     }
 
+    // min/max
+    // Not filled yet since it is stil too costly to calculate min/max
+    // for each slice... It will be filled at first use (see view.setWindowLevelPreset).
+    // Order is important, if no wl from DICOM, this will be the default.
+    windowPresets.minmax = { "name": "minmax" };
+
     // optional modality presets
     if ( typeof dwv.tool.defaultpresets !== "undefined" ) {
         var modality = image.getMeta().Modality;
@@ -785,10 +786,6 @@ dwv.image.ViewFactory.prototype.create = function (dicomElements, image)
         }
     }
 
-    // TODO min/max preset
-    // not yet since it is stil too costly to calculate min/max
-    // for each slice...
-
     // store
     view.setWindowPresets( windowPresets );