From c13e5b097ba416717f7f4af94324fedf480eb3f4 Mon Sep 17 00:00:00 2001
From: Vadim Lopatin <coolreader.org@gmail.com>
Date: Thu, 4 Dec 2014 15:47:40 +0300
Subject: [PATCH] resizers: continue development

---
 examples/example1/src/main.d  | 27 +++++++++++++++++++++++++--
 src/dlangui/widgets/layouts.d | 17 +++++++++++++----
 2 files changed, 38 insertions(+), 6 deletions(-)

diff --git a/examples/example1/src/main.d b/examples/example1/src/main.d
index ff8a9e52..3563e733 100644
--- a/examples/example1/src/main.d
+++ b/examples/example1/src/main.d
@@ -20,6 +20,7 @@ import dlangui.dialogs.dialog;
 import dlangui.dialogs.filedlg;
 import std.stdio;
 import std.conv;
+import std.utf;
 
 
 mixin APP_ENTRY_POINT;
@@ -625,7 +626,7 @@ extern (C) int UIAppMain(string[] args) {
         //==========================================================================
         // tree view example
 		TreeWidget tree = new TreeWidget("TREE1");
-		tree.layoutWidth(FILL_PARENT).layoutHeight(FILL_PARENT);
+		tree.layoutWidth(WRAP_CONTENT).layoutHeight(FILL_PARENT);
         TreeItem tree1 = tree.items.newChild("group1", "Group 1"d, "document-open");
         tree1.newChild("g1_1", "Group 1 item 1"d);
         tree1.newChild("g1_2", "Group 1 item 2"d);
@@ -648,8 +649,30 @@ extern (C) int UIAppMain(string[] args) {
         tree3.newChild("g3_5", "Group 3 item 5"d);
         tree3.newChild("g3_6", "Group 3 item 6"d);
 
+        LinearLayout treeLayout = new HorizontalLayout("TREE");
+        LinearLayout treeControlledPanel = new VerticalLayout();
+        treeLayout.layoutWidth = FILL_PARENT;
+        treeControlledPanel.layoutWidth = FILL_PARENT;
+        treeControlledPanel.layoutHeight = FILL_PARENT;
+        TextWidget treeItemLabel = new TextWidget("TREE_ITEM_DESC");
+        treeItemLabel.layoutWidth = FILL_PARENT;
+        treeItemLabel.layoutHeight = FILL_PARENT;
+        treeItemLabel.alignment = Align.Center;
+        treeItemLabel.text = "Sample text"d;
+        treeControlledPanel.addChild(treeItemLabel);
+        treeLayout.addChild(tree);
+        treeLayout.addChild(new ResizerWidget());
+        treeLayout.addChild(treeControlledPanel);
+
+        tree.selectionListener = delegate(TreeItems source, TreeItem selectedItem, bool activated) {
+            dstring label = "Selected item: "d ~ toUTF32(selectedItem.id) ~ (activated ? " selected + activated"d : " selected"d);
+            treeItemLabel.text = label;
+        };
+
+
         tree.items.selectItem(tree.items.child(0));
-		tabs.addTab(tree, "Tree"d);
+
+		tabs.addTab(treeLayout, "Tree"d);
 
 
         //==========================================================================
diff --git a/src/dlangui/widgets/layouts.d b/src/dlangui/widgets/layouts.d
index b5a6ee8c..6b8f536f 100644
--- a/src/dlangui/widgets/layouts.d
+++ b/src/dlangui/widgets/layouts.d
@@ -38,6 +38,8 @@ struct LayoutItem {
 	int _maxSize; //  max size for primary dimension
 	int _weight; // weight
 	bool _fillParent;
+    bool _isResizer;
+    @property bool canExtend() { return !_isResizer; }
     @property int measuredSize() { return _measuredSize; }
     @property int minSize() { return _measuredSize; }
     @property int maxSize() { return _maxSize; }
@@ -53,6 +55,8 @@ struct LayoutItem {
     void set(Widget widget, Orientation orientation) {
 		_widget = widget;
 		_orientation = orientation;
+        if (cast(ResizerWidget)widget)
+            _isResizer = true;
     }
 	/// set item and measure it
 	void measure(int parentWidth, int parentHeight) {
@@ -144,6 +148,7 @@ class LayoutItems {
         int maxItem = 0; // max item dimention
         // calc total size
         int visibleCount = cast(int)_list.length;
+        int resizersSize = 0;
         for (int i = 0; i < _count; i++) {
 			LayoutItem * item = &_list[i];
             int weight = item.weight;
@@ -151,7 +156,9 @@ class LayoutItems {
             totalSize += size;
             if (maxItem < item.secondarySize)
                 maxItem = item.secondarySize;
-            if (item.fillParent) {
+            if (item._isResizer) {
+                resizersSize += size;
+            } else if (item.fillParent) {
                 resizableWeight += weight;
                 resizableSize += size * weight;
             } else {
@@ -179,6 +186,8 @@ class LayoutItems {
         bool needResize = false;
         int scaleFactor = 10000; // per weight unit
         if (delta != 0 && visibleCount > 0) {
+            if (delta < 0)
+                nonresizableSize += resizersSize; // allow to shrink resizers
             // need resize of some children
             needResize = true;
 			// resize all if need to shrink or only resizable are too small to correct delta
@@ -196,7 +205,7 @@ class LayoutItems {
 		int lastResized = -1;
         for (int i = 0; i < _count; i++) {
 			LayoutItem * item = &_list[i];
-            if (item.fillParent || needForceResize) {
+            if ((item.fillParent || needForceResize) && (delta < 0 || item.canExtend)) {
 				lastResized = i;
             }
 		}
@@ -210,7 +219,7 @@ class LayoutItems {
 			int size = item.measuredSize;
             if (needResize && (layoutSize == FILL_PARENT || needForceResize)) {
 				// do resize
-				int correction = scaleFactor * weight * size / 10000;
+				int correction = (delta < 0 || item.canExtend) ? scaleFactor * weight * size / 10000 : 0;
 				deltaTotal += correction;
 				// for last resized, apply additional correction to resolve calculation inaccuracy
 				if (i == lastResized) {
@@ -274,7 +283,7 @@ class ResizerWidget : Widget {
         }
 	}
 
-    void updateProps() {
+    protected void updateProps() {
         _previousWidget = null;
         _nextWidget = null;
         _orientation = Orientation.Vertical;