working...

src/HTMLRenderer/StateTracker.h

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+/*
+ * StateTracker.h
+ *
+ * track specific PDF state
+ * manage reusable CSS classes
+ *
+ * Copyright (C) 2013 Lu Wang <coolwanglu@gmail.com>
+ */
+
+#ifndef STATE_TRACKER_H__
+#define STATE_TRACKER_H__
+
+#include <GfxState.h>
+
+
+namespace pdf2htmlEX {
+
+class StateTrackerBase
+{
+public:
+    virtual ~StateTracker(void);
+
+    // usually called at the beginning of a page
+    virtual void reset(void) = 0;
+    /*
+     * update() is called when PDF updates the state
+     * check_state() is called when we really need the new state
+     *
+     * There could be a number of calls to update() between 2 consecutive calls to check_state()
+     * So usually we just mark as changed in update, and actually retrive from the state in check_state()
+     */
+    virtual void update(GfxState * state) = 0;
+    /*
+     * return if state has been updated
+     *
+     * if force is true, do check the state if there is no update() called before
+     * useful for updateAll
+     */
+    virtual bool check_state(GfxState * state, bool force) = 0;
+
+    long long get_id() const { return id; }
+
+protected:
+    long long id; // For CSS classe
+};
+
+
+} // namespace pdf2htmlEX 
+
+#endif //STATE_TRACKER_H__