| 1 | unit UPersistentForm;
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| 2 |
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| 3 | // Date: 2020-11-26
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| 4 |
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| 5 | interface
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| 6 |
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| 7 | uses
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| 8 | Classes, SysUtils, Forms, URegistry, LCLIntf, Registry, Controls, ComCtrls,
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| 9 | ExtCtrls, LCLType;
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| 10 |
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| 11 | type
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| 12 |
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| 13 | { TPersistentForm }
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| 14 |
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| 15 | TPersistentForm = class(TComponent)
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| 16 | private
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| 17 | FEntireVisible: Boolean;
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| 18 | FMinVisiblePart: Integer;
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| 19 | FRegistryContext: TRegistryContext;
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| 20 | procedure LoadControl(Control: TControl);
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| 21 | procedure SaveControl(Control: TControl);
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| 22 | public
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| 23 | FormNormalSize: TRect;
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| 24 | FormRestoredSize: TRect;
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| 25 | FormWindowState: TWindowState;
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| 26 | FormFullScreen: Boolean;
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| 27 | Form: TForm;
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| 28 | procedure LoadFromRegistry(RegistryContext: TRegistryContext);
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| 29 | procedure SaveToRegistry(RegistryContext: TRegistryContext);
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| 30 | function CheckEntireVisible(Rect: TRect): TRect;
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| 31 | function CheckPartVisible(Rect: TRect; Part: Integer): TRect;
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| 32 | procedure Load(Form: TForm; DefaultMaximized: Boolean = False;
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| 33 | DefaultFullScreen: Boolean = False);
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| 34 | procedure Save(Form: TForm);
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| 35 | constructor Create(AOwner: TComponent); override;
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| 36 | procedure SetFullScreen(State: Boolean);
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| 37 | property RegistryContext: TRegistryContext read FRegistryContext
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| 38 | write FRegistryContext;
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| 39 | published
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| 40 | property MinVisiblePart: Integer read FMinVisiblePart write FMinVisiblePart;
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| 41 | property EntireVisible: Boolean read FEntireVisible write FEntireVisible;
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| 42 | end;
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| 43 |
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| 44 | procedure Register;
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| 45 |
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| 46 |
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| 47 | implementation
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| 48 |
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| 49 | procedure Register;
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| 50 | begin
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| 51 | RegisterComponents('Common', [TPersistentForm]);
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| 52 | end;
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| 53 |
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| 54 | { TPersistentForm }
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| 55 |
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| 56 | procedure TPersistentForm.LoadControl(Control: TControl);
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| 57 | var
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| 58 | I: Integer;
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| 59 | WinControl: TWinControl;
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| 60 | begin
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| 61 | if Control is TListView then begin
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| 62 | with Form, TRegistryEx.Create do
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| 63 | try
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| 64 | RootKey := RegistryContext.RootKey;
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| 65 | OpenKey(RegistryContext.Key + '\Forms\' + Form.Name + '\' + Control.Name, True);
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| 66 | for I := 0 to TListView(Control).Columns.Count - 1 do begin
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| 67 | if ValueExists('ColWidth' + IntToStr(I)) then
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| 68 | TListView(Control).Columns[I].Width := ReadInteger('ColWidth' + IntToStr(I));
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| 69 | end;
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| 70 | finally
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| 71 | Free;
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| 72 | end;
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| 73 | end;
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| 74 |
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| 75 | if (Control is TPanel) then begin
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| 76 | with Form, TRegistryEx.Create do
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| 77 | try
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| 78 | RootKey := RegistryContext.RootKey;
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| 79 | OpenKey(RegistryContext.Key + '\Forms\' + Form.Name + '\' + Control.Name, True);
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| 80 | if (TPanel(Control).Align = alRight) or (TPanel(Control).Align = alLeft) then begin
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| 81 | if ValueExists('Width') then
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| 82 | TPanel(Control).Width := ReadInteger('Width');
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| 83 | end;
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| 84 | if (TPanel(Control).Align = alTop) or (TPanel(Control).Align = alBottom) then begin
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| 85 | if ValueExists('Height') then
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| 86 | TPanel(Control).Height := ReadInteger('Height');
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| 87 | end;
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| 88 | finally
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| 89 | Free;
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| 90 | end;
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| 91 | end;
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| 92 |
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| 93 | if Control is TWinControl then begin
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| 94 | WinControl := TWinControl(Control);
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| 95 | if WinControl.ControlCount > 0 then begin
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| 96 | for I := 0 to WinControl.ControlCount - 1 do begin
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| 97 | if WinControl.Controls[I] is TControl then begin
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| 98 | LoadControl(WinControl.Controls[I]);
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| 99 | end;
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| 100 | end;
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| 101 | end;
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| 102 | end;
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| 103 | end;
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| 104 |
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| 105 | procedure TPersistentForm.SaveControl(Control: TControl);
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| 106 | var
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| 107 | I: Integer;
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| 108 | WinControl: TWinControl;
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| 109 | begin
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| 110 | if Control is TListView then begin
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| 111 | with Form, TRegistryEx.Create do
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| 112 | try
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| 113 | RootKey := RegistryContext.RootKey;
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| 114 | OpenKey(RegistryContext.Key + '\Forms\' + Form.Name + '\' + Control.Name, True);
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| 115 | for I := 0 to TListView(Control).Columns.Count - 1 do begin
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| 116 | WriteInteger('ColWidth' + IntToStr(I), TListView(Control).Columns[I].Width);
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| 117 | end;
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| 118 | finally
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| 119 | Free;
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| 120 | end;
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| 121 | end;
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| 122 |
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| 123 | if (Control is TPanel) then begin
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| 124 | with Form, TRegistryEx.Create do
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| 125 | try
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| 126 | RootKey := RegistryContext.RootKey;
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| 127 | OpenKey(RegistryContext.Key + '\Forms\' + Form.Name + '\' + Control.Name, True);
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| 128 | if (TPanel(Control).Align = alRight) or (TPanel(Control).Align = alLeft) then begin
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| 129 | WriteInteger('Width', TPanel(Control).Width);
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| 130 | end;
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| 131 | if (TPanel(Control).Align = alTop) or (TPanel(Control).Align = alBottom) then begin
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| 132 | WriteInteger('Height', TPanel(Control).Height);
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| 133 | end;
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| 134 | finally
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| 135 | Free;
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| 136 | end;
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| 137 | end;
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| 138 |
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| 139 | if Control is TWinControl then begin
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| 140 | WinControl := TWinControl(Control);
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| 141 | if WinControl.ControlCount > 0 then begin
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| 142 | for I := 0 to WinControl.ControlCount - 1 do begin
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| 143 | if WinControl.Controls[I] is TControl then begin
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| 144 | SaveControl(WinControl.Controls[I]);
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| 145 | end;
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| 146 | end;
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| 147 | end;
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| 148 | end;
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| 149 | end;
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| 150 |
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| 151 | procedure TPersistentForm.LoadFromRegistry(RegistryContext: TRegistryContext);
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| 152 | begin
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| 153 | with TRegistryEx.Create do
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| 154 | try
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| 155 | RootKey := RegistryContext.RootKey;
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| 156 | OpenKey(RegistryContext.Key + '\Forms\' + Form.Name, True);
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| 157 | // Normal size
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| 158 | FormNormalSize.Left := ReadIntegerWithDefault('NormalLeft', FormNormalSize.Left);
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| 159 | FormNormalSize.Top := ReadIntegerWithDefault('NormalTop', FormNormalSize.Top);
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| 160 | FormNormalSize.Right := ReadIntegerWithDefault('NormalWidth', FormNormalSize.Right - FormNormalSize.Left)
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| 161 | + FormNormalSize.Left;
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| 162 | FormNormalSize.Bottom := ReadIntegerWithDefault('NormalHeight', FormNormalSize.Bottom - FormNormalSize.Top)
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| 163 | + FormNormalSize.Top;
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| 164 | // Restored size
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| 165 | FormRestoredSize.Left := ReadIntegerWithDefault('RestoredLeft', FormRestoredSize.Left);
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| 166 | FormRestoredSize.Top := ReadIntegerWithDefault('RestoredTop', FormRestoredSize.Top);
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| 167 | FormRestoredSize.Right := ReadIntegerWithDefault('RestoredWidth', FormRestoredSize.Right - FormRestoredSize.Left)
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| 168 | + FormRestoredSize.Left;
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| 169 | FormRestoredSize.Bottom := ReadIntegerWithDefault('RestoredHeight', FormRestoredSize.Bottom - FormRestoredSize.Top)
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| 170 | + FormRestoredSize.Top;
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| 171 | // Other state
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| 172 | FormWindowState := TWindowState(ReadIntegerWithDefault('WindowState', Integer(FormWindowState)));
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| 173 | FormFullScreen := ReadBoolWithDefault('FullScreen', FormFullScreen);
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| 174 | finally
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| 175 | Free;
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| 176 | end;
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| 177 | end;
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| 178 |
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| 179 | procedure TPersistentForm.SaveToRegistry(RegistryContext: TRegistryContext);
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| 180 | begin
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| 181 | with Form, TRegistryEx.Create do
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| 182 | try
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| 183 | RootKey := RegistryContext.RootKey;
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| 184 | OpenKey(RegistryContext.Key + '\Forms\' + Form.Name, True);
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| 185 | // Normal state
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| 186 | WriteInteger('NormalWidth', FormNormalSize.Right - FormNormalSize.Left);
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| 187 | WriteInteger('NormalHeight', FormNormalSize.Bottom - FormNormalSize.Top);
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| 188 | WriteInteger('NormalTop', FormNormalSize.Top);
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| 189 | WriteInteger('NormalLeft', FormNormalSize.Left);
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| 190 | // Restored state
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| 191 | WriteInteger('RestoredWidth', FormRestoredSize.Right - FormRestoredSize.Left);
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| 192 | WriteInteger('RestoredHeight', FormRestoredSize.Bottom - FormRestoredSize.Top);
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| 193 | WriteInteger('RestoredTop', FormRestoredSize.Top);
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| 194 | WriteInteger('RestoredLeft', FormRestoredSize.Left);
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| 195 | // Other state
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| 196 | WriteInteger('WindowState', Integer(FormWindowState));
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| 197 | WriteBool('FullScreen', FormFullScreen);
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| 198 | finally
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| 199 | Free;
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| 200 | end;
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| 201 | end;
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| 202 |
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| 203 | function TPersistentForm.CheckEntireVisible(Rect: TRect): TRect;
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| 204 | var
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| 205 | Width: Integer;
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| 206 | Height: Integer;
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| 207 | begin
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| 208 | Result := Rect;
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| 209 | Width := Rect.Right - Rect.Left;
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| 210 | Height := Rect.Bottom - Rect.Top;
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| 211 | if Result.Left < (Screen.DesktopLeft) then begin
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| 212 | Result.Left := Screen.DesktopLeft;
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| 213 | Result.Right := Screen.DesktopLeft + Width;
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| 214 | end;
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| 215 | if Result.Right > (Screen.DesktopLeft + Screen.DesktopWidth) then begin
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| 216 | Result.Left := Screen.DesktopLeft + Screen.DesktopWidth - Width;
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| 217 | Result.Right := Screen.DesktopLeft + Screen.DesktopWidth;
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| 218 | end;
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| 219 | if Result.Top < Screen.DesktopTop then begin
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| 220 | Result.Top := Screen.DesktopTop;
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| 221 | Result.Bottom := Screen.DesktopTop + Height;
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| 222 | end;
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| 223 | if Result.Bottom > (Screen.DesktopTop + Screen.DesktopHeight) then begin
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| 224 | Result.Top := Screen.DesktopTop + Screen.DesktopHeight - Height;
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| 225 | Result.Bottom := Screen.DesktopTop + Screen.DesktopHeight;
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| 226 | end;
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| 227 | end;
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| 228 |
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| 229 | function TPersistentForm.CheckPartVisible(Rect: TRect; Part: Integer): TRect;
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| 230 | var
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| 231 | Width: Integer;
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| 232 | Height: Integer;
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| 233 | begin
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| 234 | Result := Rect;
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| 235 | Width := Rect.Right - Rect.Left;
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| 236 | Height := Rect.Bottom - Rect.Top;
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| 237 | if Result.Right < (Screen.DesktopLeft + Part) then begin
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| 238 | Result.Left := Screen.DesktopLeft + Part - Width;
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| 239 | Result.Right := Screen.DesktopLeft + Part;
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| 240 | end;
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| 241 | if Result.Left > (Screen.DesktopLeft + Screen.DesktopWidth - Part) then begin
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| 242 | Result.Left := Screen.DesktopLeft + Screen.DesktopWidth - Part;
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| 243 | Result.Right := Screen.DesktopLeft + Screen.DesktopWidth - Part + Width;
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| 244 | end;
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| 245 | if Result.Bottom < (Screen.DesktopTop + Part) then begin
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| 246 | Result.Top := Screen.DesktopTop + Part - Height;
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| 247 | Result.Bottom := Screen.DesktopTop + Part;
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| 248 | end;
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| 249 | if Result.Top > (Screen.DesktopTop + Screen.DesktopHeight - Part) then begin
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| 250 | Result.Top := Screen.DesktopTop + Screen.DesktopHeight - Part;
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| 251 | Result.Bottom := Screen.DesktopTop + Screen.DesktopHeight - Part + Height;
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| 252 | end;
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| 253 | end;
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| 254 |
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| 255 | procedure TPersistentForm.Load(Form: TForm; DefaultMaximized: Boolean = False;
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| 256 | DefaultFullScreen: Boolean = False);
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| 257 | begin
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| 258 | Self.Form := Form;
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| 259 | // Set default
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| 260 | FormNormalSize := Bounds((Screen.Width - Form.Width) div 2,
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| 261 | (Screen.Height - Form.Height) div 2, Form.Width, Form.Height);
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| 262 | FormRestoredSize := Bounds((Screen.Width - Form.Width) div 2,
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| 263 | (Screen.Height - Form.Height) div 2, Form.Width, Form.Height);
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| 264 | FormWindowState := Form.WindowState;
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| 265 | FormFullScreen := DefaultFullScreen;
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| 266 |
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| 267 | LoadFromRegistry(RegistryContext);
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| 268 |
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| 269 | if not EqualRect(FormNormalSize, FormRestoredSize) or
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| 270 | DefaultMaximized then begin
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| 271 | // Restore to maximized state
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| 272 | Form.WindowState := wsNormal;
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| 273 | if not EqualRect(FormRestoredSize, Form.BoundsRect) then
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| 274 | Form.BoundsRect := FormRestoredSize;
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| 275 | Form.WindowState := wsMaximized;
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| 276 | end else begin
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| 277 | // Restore to normal state
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| 278 | Form.WindowState := wsNormal;
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| 279 | if FEntireVisible then FormNormalSize := CheckEntireVisible(FormNormalSize)
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| 280 | else if FMinVisiblePart > 0 then
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| 281 | FormNormalSize := CheckPartVisible(FormNormalSize, FMinVisiblePart);
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| 282 | if not EqualRect(FormNormalSize, Form.BoundsRect) then
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| 283 | Form.BoundsRect := FormNormalSize;
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| 284 | end;
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| 285 | if FormFullScreen then SetFullScreen(True);
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| 286 | LoadControl(Form);
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| 287 | end;
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| 288 |
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| 289 | procedure TPersistentForm.Save(Form: TForm);
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| 290 | begin
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| 291 | Self.Form := Form;
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| 292 | FormNormalSize := Bounds(Form.Left, Form.Top, Form.Width, Form.Height);
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| 293 | if not FormFullScreen then
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| 294 | FormRestoredSize := Bounds(Form.RestoredLeft, Form.RestoredTop, Form.RestoredWidth,
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| 295 | Form.RestoredHeight);
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| 296 | FormWindowState := Form.WindowState;
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| 297 | SaveToRegistry(RegistryContext);
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| 298 | SaveControl(Form);
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| 299 | end;
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| 300 |
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| 301 | constructor TPersistentForm.Create(AOwner: TComponent);
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| 302 | begin
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| 303 | inherited;
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| 304 | if AOwner is TForm then Form := TForm(AOwner)
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| 305 | else Form := nil;
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| 306 | FMinVisiblePart := 50;
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| 307 | FRegistryContext.RootKey := HKEY_CURRENT_USER;
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| 308 | end;
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| 309 |
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| 310 | procedure TPersistentForm.SetFullScreen(State: Boolean);
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| 311 | begin
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| 312 | if State then begin
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| 313 | FormFullScreen := True;
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| 314 | FormNormalSize := Form.BoundsRect;
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| 315 | FormRestoredSize := Bounds(Form.RestoredLeft, Form.RestoredTop, Form.RestoredWidth,
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| 316 | Form.RestoredHeight);
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| 317 | FormWindowState := Form.WindowState;
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| 318 | ShowWindow(Form.Handle, SW_SHOWFULLSCREEN);
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| 319 | {$IFDEF WINDOWS}
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| 320 | Form.BorderStyle := bsNone;
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| 321 | {$ENDIF}
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| 322 | end else begin
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| 323 | FormFullScreen := False;
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| 324 | {$IFDEF WINDOWS}
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| 325 | Form.BorderStyle := bsSizeable;
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| 326 | {$ENDIF}
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| 327 | ShowWindow(Form.Handle, SW_SHOWNORMAL);
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| 328 | if FormWindowState = wsNormal then begin
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| 329 | Form.BoundsRect := FormNormalSize;
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| 330 | end else
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| 331 | if FormWindowState = wsMaximized then begin
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| 332 | Form.BoundsRect := FormRestoredSize;
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| 333 | Form.WindowState := wsMaximized;
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| 334 | end;
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| 335 | end;
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| 336 | end;
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| 337 |
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| 338 | end.
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| 339 |
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