v01

thirdparty/Pangolin/include/pangolin/var/varstate.h

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+/* This file is part of the Pangolin Project.
+ * http://github.com/stevenlovegrove/Pangolin
+ *
+ * Copyright (c) 2014 Steven Lovegrove
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#pragma once
+
+#include <map>
+#include <vector>
+#include <pangolin/platform.h>
+#include <pangolin/var/varvalue.h>
+#include <pangolin/utils/file_utils.h>
+
+namespace pangolin
+{
+
+typedef void (*NewVarCallbackFn)(void* data, const std::string& name, VarValueGeneric& var, bool brand_new);
+typedef void (*GuiVarChangedCallbackFn)(void* data, const std::string& name, VarValueGeneric& var);
+
+struct PANGOLIN_EXPORT NewVarCallback
+{
+    NewVarCallback(const std::string& filter, NewVarCallbackFn fn, void* data)
+        :filter(filter),fn(fn),data(data) {}
+    std::string filter;
+    NewVarCallbackFn fn;
+    void* data;
+};
+
+struct PANGOLIN_EXPORT GuiVarChangedCallback
+{
+    GuiVarChangedCallback(const std::string& filter, GuiVarChangedCallbackFn fn, void* data)
+        :filter(filter),fn(fn),data(data) {}
+    std::string filter;
+    GuiVarChangedCallbackFn fn;
+    void* data;
+};
+
+class PANGOLIN_EXPORT VarState
+{
+public:
+    static VarState& I();
+
+    VarState();
+    ~VarState();
+
+    void Clear();
+
+    template<typename T>
+    void NotifyNewVar(const std::string& name, VarValue<T>& var )
+    {
+        var_adds.push_back(name);
+
+        // notify those watching new variables
+        for(std::vector<NewVarCallback>::iterator invc = new_var_callbacks.begin(); invc != new_var_callbacks.end(); ++invc) {
+            if( StartsWith(name,invc->filter) ) {
+               invc->fn( invc->data, name, var, true);
+            }
+        }
+    }
+
+    VarValueGeneric*& operator[](const std::string& str)
+    {
+        VarStoreContainer::iterator it = vars.find(str);
+        if (it == vars.end()) {
+            vars[str] = nullptr;
+        }
+        return vars[str];
+    }
+
+    bool Exists(const std::string& str) const
+    {
+        return vars.find(str) != vars.end();
+    }
+
+    void FlagVarChanged()
+    {
+        varHasChanged = true;
+    }
+
+    bool VarHasChanged()
+    {
+        const bool has_changed = varHasChanged;
+        varHasChanged = false;
+        return has_changed;
+    }
+
+//protected:
+    typedef std::map<std::string, VarValueGeneric*> VarStoreContainer;
+    typedef std::vector<std::string> VarStoreAdditions;
+
+    VarStoreContainer vars;
+    VarStoreAdditions var_adds;
+
+    std::vector<NewVarCallback> new_var_callbacks;
+    std::vector<GuiVarChangedCallback> gui_var_changed_callbacks;
+
+    bool varHasChanged;
+};
+
+inline bool GuiVarHasChanged() {
+    return VarState::I().VarHasChanged();
+}
+
+inline void FlagVarChanged() {
+    VarState::I().FlagVarChanged();
+}
+
+}