1 files changed, 121 insertions, 0 deletions
diff --git a/src/node/ui_interface.h b/src/node/ui_interface.h
new file mode 100644
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--- /dev/null
+++ b/src/node/ui_interface.h
@@ -0,0 +1,121 @@
+// Copyright (c) 2010 Satoshi Nakamoto
+// Copyright (c) 2012-2020 The Bitcoin Core developers
+// Distributed under the MIT software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#ifndef BITCOIN_NODE_UI_INTERFACE_H
+#define BITCOIN_NODE_UI_INTERFACE_H
+
+#include <functional>
+#include <memory>
+#include <string>
+
+class CBlockIndex;
+enum class SynchronizationState;
+struct bilingual_str;
+
+namespace boost {
+namespace signals2 {
+class connection;
+}
+} // namespace boost
+
+/** Signals for UI communication. */
+class CClientUIInterface
+{
+public:
+    /** Flags for CClientUIInterface::ThreadSafeMessageBox */
+    enum MessageBoxFlags
+    {
+        ICON_INFORMATION    = 0,
+        ICON_WARNING        = (1U << 0),
+        ICON_ERROR          = (1U << 1),
+        /**
+         * Mask of all available icons in CClientUIInterface::MessageBoxFlags
+         * This needs to be updated, when icons are changed there!
+         */
+        ICON_MASK = (ICON_INFORMATION | ICON_WARNING | ICON_ERROR),
+
+        /** These values are taken from qmessagebox.h "enum StandardButton" to be directly usable */
+        BTN_OK      = 0x00000400U, // QMessageBox::Ok
+        BTN_YES     = 0x00004000U, // QMessageBox::Yes
+        BTN_NO      = 0x00010000U, // QMessageBox::No
+        BTN_ABORT   = 0x00040000U, // QMessageBox::Abort
+        BTN_RETRY   = 0x00080000U, // QMessageBox::Retry
+        BTN_IGNORE  = 0x00100000U, // QMessageBox::Ignore
+        BTN_CLOSE   = 0x00200000U, // QMessageBox::Close
+        BTN_CANCEL  = 0x00400000U, // QMessageBox::Cancel
+        BTN_DISCARD = 0x00800000U, // QMessageBox::Discard
+        BTN_HELP    = 0x01000000U, // QMessageBox::Help
+        BTN_APPLY   = 0x02000000U, // QMessageBox::Apply
+        BTN_RESET   = 0x04000000U, // QMessageBox::Reset
+        /**
+         * Mask of all available buttons in CClientUIInterface::MessageBoxFlags
+         * This needs to be updated, when buttons are changed there!
+         */
+        BTN_MASK = (BTN_OK | BTN_YES | BTN_NO | BTN_ABORT | BTN_RETRY | BTN_IGNORE |
+                    BTN_CLOSE | BTN_CANCEL | BTN_DISCARD | BTN_HELP | BTN_APPLY | BTN_RESET),
+
+        /** Force blocking, modal message box dialog (not just OS notification) */
+        MODAL               = 0x10000000U,
+
+        /** Do not print contents of message to debug log */
+        SECURE              = 0x40000000U,
+
+        /** Predefined combinations for certain default usage cases */
+        MSG_INFORMATION = ICON_INFORMATION,
+        MSG_WARNING = (ICON_WARNING | BTN_OK | MODAL),
+        MSG_ERROR = (ICON_ERROR | BTN_OK | MODAL)
+    };
+
+#define ADD_SIGNALS_DECL_WRAPPER(signal_name, rtype, ...)                                  \
+    rtype signal_name(__VA_ARGS__);                                                        \
+    using signal_name##Sig = rtype(__VA_ARGS__);                                           \
+    boost::signals2::connection signal_name##_connect(std::function<signal_name##Sig> fn);
+
+    /** Show message box. */
+    ADD_SIGNALS_DECL_WRAPPER(ThreadSafeMessageBox, bool, const bilingual_str& message, const std::string& caption, unsigned int style);
+
+    /** If possible, ask the user a question. If not, falls back to ThreadSafeMessageBox(noninteractive_message, caption, style) and returns false. */
+    ADD_SIGNALS_DECL_WRAPPER(ThreadSafeQuestion, bool, const bilingual_str& message, const std::string& noninteractive_message, const std::string& caption, unsigned int style);
+
+    /** Progress message during initialization. */
+    ADD_SIGNALS_DECL_WRAPPER(InitMessage, void, const std::string& message);
+
+    /** Number of network connections changed. */
+    ADD_SIGNALS_DECL_WRAPPER(NotifyNumConnectionsChanged, void, int newNumConnections);
+
+    /** Network activity state changed. */
+    ADD_SIGNALS_DECL_WRAPPER(NotifyNetworkActiveChanged, void, bool networkActive);
+
+    /**
+     * Status bar alerts changed.
+     */
+    ADD_SIGNALS_DECL_WRAPPER(NotifyAlertChanged, void, );
+
+    /**
+     * Show progress e.g. for verifychain.
+     * resume_possible indicates shutting down now will result in the current progress action resuming upon restart.
+     */
+    ADD_SIGNALS_DECL_WRAPPER(ShowProgress, void, const std::string& title, int nProgress, bool resume_possible);
+
+    /** New block has been accepted */
+    ADD_SIGNALS_DECL_WRAPPER(NotifyBlockTip, void, SynchronizationState, const CBlockIndex*);
+
+    /** Best header has changed */
+    ADD_SIGNALS_DECL_WRAPPER(NotifyHeaderTip, void, SynchronizationState, const CBlockIndex*);
+
+    /** Banlist did change. */
+    ADD_SIGNALS_DECL_WRAPPER(BannedListChanged, void, void);
+};
+
+/** Show warning message **/
+void InitWarning(const bilingual_str& str);
+
+/** Show error message **/
+bool InitError(const bilingual_str& str);
+constexpr auto AbortError = InitError;
+
+extern CClientUIInterface uiInterface;
+
+#endif // BITCOIN_NODE_UI_INTERFACE_H