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// *****************************************************************************
// * This file is part of the FreeFileSync project. It is distributed under *
// * GNU General Public License: https://www.gnu.org/licenses/gpl-3.0 *
// * Copyright (C) Zenju (zenju AT freefilesync DOT org) - All Rights Reserved *
// *****************************************************************************
#ifndef NO_FLICKER_H_893421590321532
#define NO_FLICKER_H_893421590321532
#include <zen/string_tools.h>
#include <zen/scope_guard.h>
#include <wx/textctrl.h>
#include <wx/stattext.h>
#include <wx/richtext/richtextctrl.h>
#include <wx/wupdlock.h>
namespace zen
{
namespace
{
void setText(wxTextCtrl& control, const wxString& newText, bool* additionalLayoutChange = nullptr)
{
const wxString& label = control.GetValue(); //perf: don't call twice!
if (additionalLayoutChange && !*additionalLayoutChange && control.IsShown()) //never revert from true to false!
*additionalLayoutChange = label.length() != newText.length(); //avoid screen flicker: update layout only when necessary
if (label != newText)
control.ChangeValue(newText);
}
void setText(wxStaticText& control, const wxString& newText, bool* additionalLayoutChange = nullptr)
{
//wxControl::EscapeMnemonics() (& -> &&) => wxControl::GetLabelText/SetLabelText
//e.g. "filenames in the sync progress dialog": https://sourceforge.net/p/freefilesync/bugs/279/
const wxString& label = control.GetLabelText(); //perf: don't call twice!
if (additionalLayoutChange && !*additionalLayoutChange && control.IsShown()) //"better" or overkill(?): IsShownOnScreen()
*additionalLayoutChange = label.length() != newText.length(); //avoid screen flicker: update layout only when necessary
if (label != newText)
control.SetLabelText(newText);
}
void setTextWithUrls(wxRichTextCtrl& richCtrl, const wxString& newText)
{
enum class BlockType
{
text,
url,
};
std::vector<std::pair<BlockType, wxString>> blocks;
for (auto it = newText.begin();;)
{
const std::wstring_view urlPrefix = L"https://";
const auto itUrl = std::search(it, newText.end(), urlPrefix.begin(), urlPrefix.end());
if (it != itUrl)
blocks.emplace_back(BlockType::text, wxString(it, itUrl));
if (itUrl == newText.end())
break;
auto itUrlEnd = std::find_if(itUrl, newText.end(), [](wchar_t c) { return isWhiteSpace(c); });
blocks.emplace_back(BlockType::url, wxString(itUrl, itUrlEnd));
it = itUrlEnd;
}
richCtrl.BeginSuppressUndo();
ZEN_ON_SCOPE_EXIT(richCtrl.EndSuppressUndo());
//fix mouse scroll speed: why the FUCK is this even necessary!
richCtrl.SetLineHeight(richCtrl.GetCharHeight());
//get rid of margins and space between text blocks/"paragraphs"
richCtrl.SetMargins({0, 0});
richCtrl.BeginParagraphSpacing(0, 0);
ZEN_ON_SCOPE_EXIT(richCtrl.EndParagraphSpacing());
richCtrl.Clear();
wxRichTextAttr urlStyle;
urlStyle.SetTextColour(*wxBLUE);
urlStyle.SetFontUnderlined(true);
for (auto& [type, text] : blocks)
switch (type)
{
case BlockType::text:
if (endsWith(text, L"\n\n")) //bug: multiple newlines before a URL are condensed to only one;
//Why? fuck knows why! no such issue with double newlines *after* URL => hack this shit
text.RemoveLast().Append(ZERO_WIDTH_SPACE).Append(L'\n');
richCtrl.WriteText(text);
break;
case BlockType::url:
{
richCtrl.BeginStyle(urlStyle);
ZEN_ON_SCOPE_EXIT(richCtrl.EndStyle());
richCtrl.BeginURL(text);
ZEN_ON_SCOPE_EXIT(richCtrl.EndURL());
richCtrl.WriteText(text);
}
break;
}
//register only once! => use a global function pointer, so that Unbind() works correctly:
using LaunchUrlFun = void(*)(wxTextUrlEvent& event);
static const LaunchUrlFun launchUrl = [](wxTextUrlEvent& event) { wxLaunchDefaultBrowser(event.GetString()); };
[[maybe_unused]] const bool unbindOk1 = richCtrl.Unbind(wxEVT_TEXT_URL, launchUrl);
if (std::any_of(blocks.begin(), blocks.end(), [](const auto& item) { return item.first == BlockType::url; }))
/**/richCtrl.Bind(wxEVT_TEXT_URL, launchUrl);
struct UserData : public wxObject
{
explicit UserData(wxRichTextCtrl& rtc) : richCtrl(rtc) {}
wxRichTextCtrl& richCtrl;
};
using KeyEventsFun = void(*)(wxKeyEvent& event);
static const KeyEventsFun onKeyEvents = [](wxKeyEvent& event)
{
wxRichTextCtrl& richCtrl2 = dynamic_cast<UserData*>(event.GetEventUserData())->richCtrl; //unclear if we can rely on event.GetEventObject() == richCtrl
//CTRL/SHIFT + INS is broken for wxRichTextCtrl on Windows/Linux (apparently never was a thing on macOS)
if (event.ControlDown())
switch (event.GetKeyCode())
{
case WXK_INSERT:
case WXK_NUMPAD_INSERT:
assert(richCtrl2.CanCopy()); //except when no selection
richCtrl2.Copy();
return;
}
if (event.ShiftDown())
switch (event.GetKeyCode())
{
case WXK_INSERT:
case WXK_NUMPAD_INSERT:
assert(richCtrl2.CanPaste()); //except wxTE_READONLY
richCtrl2.Paste();
return;
}
event.Skip();
};
[[maybe_unused]] const bool unbindOk2 = richCtrl.Unbind(wxEVT_KEY_DOWN, onKeyEvents);
/**/ richCtrl. Bind(wxEVT_KEY_DOWN, onKeyEvents, wxID_ANY, wxID_ANY, new UserData(richCtrl) /*pass ownership*/);
}
}
}
#endif //NO_FLICKER_H_893421590321532
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